It is not unusual at all for teens to answer their parents with one work answers. “Where are you going?” “Places.” “When will you be back?” “Sometime.” “Who will you be with?” “People.”

That means that the days of your children bounding in the front door with the details of their day are over. They are breaking away from you so that they’ll be able to stand on their own as a young adult.

Some parents feel sad about this loss of their children’s closeness. Of course you miss those conversations and friendly talks. Once your children move out after high school and establish themselves confidently as a young adult, they’ll come back for easy conversations and even ask for advice. But in order to determine who they are right now they need to separate from you.

Your job, however, is to keep them safe——and that requires knowing there they are and who they are with. Let them know clearly that it’s not because you want to dominate their life and control them; it’s because it’s a safety issue for family members to keep track of one another.

When they’re home and sit down to eat a meal, sit down with them. You need to open up to them about your life. Tell them of an interesting incident at the office, let them in on a bit of family gossip(闲谈), discuss a piece of news with them. They are glad that you see them as old enough to be in on a few experiences of your life. By letting a teen in on your life, they just may let you in of theirs

The underlined word “That” in Paragraph 2 probably refers to “       ”.

     A．teens no longer tell parents their detailed information

     B．teens don’t tell parents where they had been any more

     C．parents are impatient to listen to their children

     D．parents are occupied by doing their business

It can be inferred from the passage that       .

     A．the generation gap is becoming wider and wider

     B．teens quarrel a lot with their parents

     C．teens don’t want to live with other family members

     D．some parents feel distant from their teenage children

The author believes that teens’ one-word answers show       .

     A．their awareness of independence     

       B．their physical and mental changes

     C．an unpleasant parent-child relationship

       D．their wishes for keeping silent

What’s the main idea of the last paragraph?

     A．Parents should understand their children.

     B．parents should keep their children safe.

     C．Parents should open their hearts to their children.

     D．Parents should give their children enough freedom.

What’s the author’s purpose in writing the passage?

     A．To give advice                 

       B．To direct teenagers

     C．To present findings                  

       D．To comfort parents

       “The world’s oceans are slowly getting more acidic．” say scientists．The researchers from California report that the change is taking place in response to higher levels of carbon dioxide in the atmosphere．

     The lowering of the waters’ PH value is not great at the moment but could cause a serious threat to current ocean life if it continues, they warn．Ken Caldeira and Michael Wickett, from the Lawrence Livermore National Laboratory, report their concerns in the journal Nature．Increasing use of oil fuels means more carbon dioxide is going into the air, and most of it will eventually be absorbed by seawater．Once in the water, it reacts to form carbonic acid．Scientists believe that the oceans have already become slightly more acidic over the last century．

       These researchers have tried to predict what will happen in the future by combining what we know about the history of the oceans with computer models of climate change．“This level of acidity will get much more extreme in the future if we continue releasing CO₂ into the atmosphere,” said Dr Caldeira．“And we predict the amount of future acidity will exceed（超过） anything we have seen over the last several hundred million years, let alone perhaps after rare disastrous events such as asteroid（小行星） impacts．

       However, it is not absolutely clear what that means for ocean life．Most organisms live near the surface, where the greatest PH change would be expected to occur, but deep-ocean life forms may be more sensitive to PH changes．Coral reefs（珊瑚礁） and other organisms whose shells contain calcium carbonate（碳酸钙） may be particularly affected if the water’s acidity levels keep going up, the team predict．They could find it much more difficult to build these structures in water with a lower PH．

       In recent years some people have suggested storing carbon dioxide from power station in the deep ocean as a way of dealing with global warming．But Dr Caldeira said that such a strategy should now be re-considered．“Previously, most experts had looked at ocean absorption of carbon dioxide as a good thing --- because in releasing CO₂ into the atmosphere we warm the planet, and when CO₂ is absorbed by the ocean, it reduces the amount of greenhouse warming．”

1．The ocean is becoming more acidic due to __________．

       A．the lower water PH value

       B．the warming atmosphere

       C．the higher level of CO₂ in the air

      D．the increasing use of oil fuels

2．According to Dr Caldeira, __________．

       A．ocean absorption of carbon dioxide is a good thing

       B．more oil fuels will be used in the near future

       C．scientists may predict climate changes with computer models

       D．the future situation of the amount of acidity is extremely serious

3．If the water’s acidity level keeps rising, __________．

       A．ocean life whose structures contain calcium carbonate may be affected

       B．the waters’ PH value will become higher and higher

       C．organisms living near the surface are more sensitive to PH changes

       D．some disastrous events will occur more often than before

4．Most experts once believed storing carbon dioxide in the ocean would reduce __________．

       A．the CO₂ absorbed by the ocean              B．the amount of greenhouse warming

       C．the acidity of the ocean                  D．the gradual release of CO₂

5．The purpose of this passage is to __________．

       A．show people the findings of a research team

       B．inform people of how acid the ocean is now

       C．introduce Dr Caldeira and his team’s research

       D．warn people of the higher level of CO₂

    It is not unusual at all for teens to answer their parents with one word answers. “Where are you going?” “Places.” “When will you be back?” “Sometime.” “Who will you be with?” “People.”

That means that the days of your children bounding in the front door with the details of their day are over. They are breaking away from you so that they’ll be able to stand on their own as a young adult.

Some parents feel sad about this loss of their children’s closeness. Of course you miss those conversations and friendly talks. Once your children move out after high school and establish themselves confidently as a young adult, they’ll come back for easy conversations and even ask for advice. But in order to determine who they are right now, they need to separate from you.

Your job, however, is to keep them safe——and that requires knowing where they are and who they are with. Let them know clearly that it’s not because you want to dominate their life and control them; it’s because it’s a safety issue（问题） for family members to keep track of one another.

When they’re home and sit down to eat a meal, sit down with them. You need to open up to them about your life. Tell them of an interesting incident at the office, let them in on a bit of family gossip（闲谈）, discuss a piece of news with them. They are glad that you see them as old enough to be in on a few experiences of your life. By letting a teen in on your life, they just may let you in on theirs.

1．The underlined word “That” in Paragraph 2 probably refers to “       ”.

     A．teens no longer tell parents their detailed information

     B．teens don’t tell parents where they had been any more

     C．parents are impatient to listen to their children

     D．parents are occupied by doing their business

2．It can be inferred from the passage that       .

     A．the generation gap is becoming wider and wider

     B．teens quarrel a lot with their parents

     C．teens don’t want to live with other family members

     D．some parents feel distant from their teenage children

3．The author believes that teens’ one-word answers show       .

     A．their awareness of independence

       B．their physical and mental changes

     C．an unpleasant parent-child relationship

       D．their wishes for keeping silent

4．What’s the main idea of the last paragraph?

     A．Parents should understand their children.

     B．Parents should keep their children safe.

     C．Parents should open their hearts to their children.

     D．Parents should give their children enough freedom.

5．What’s the author’s purpose in writing the passage?

     A．To give advice                               B．To direct teenagers

     C．To present findings                          D．To comfort parents

“The world’s oceans are slowly getting more acidic．” say scientists．The researchers from California report that the change is taking place in response to higher levels of carbon dioxide in the atmosphere．

The lowering of the waters’ pH value is not great at the moment but could cause a serious threat to current ocean life if it continues, they warn．Ken Caldeira and Michael Wickett, from the Lawrence Livermore National Laboratory, report their concerns in the journal Nature．Increasing use of oil fuels means more carbon dioxide is going into the air, and most of it will eventually be absorbed by seawater．Once in the water, it reacts to form carbonic acid．Scientists believe that the oceans have already become slightly more acidic over the last century．

These researchers have tried to predict what will happen in the future by combining what we know about the history of the oceans with computer models of climate change．“This level of acidity will get much more extreme in the future if we continue releasing CO into the atmosphere,” said Dr Caldeira．“And we predict the amount of future acidity will exceed（超过） anything we have seen over the last several hundred million years, let alone perhaps after rare disastrous events such as asteroid（小行星） impacts．

However, it is not absolutely clear what that means for ocean life．Most organisms live near the surface, where the greatest pH change would be expected to occur, but deep-ocean life forms may be more sensitive to pH changes．Coral reefs（珊瑚礁） and other organisms whose shells contain calcium carbonate（碳酸钙） may be particularly affected if the water’s acidity levels keep going up, the team predict．They could find it much more difficult to build these structures in water with a lower pH．

In recent years some people have suggested storing carbon dioxide from power station in the deep ocean as a way of dealing with global warming．But Dr Caldeira said that such a strategy should now be re-considered．“Previously, most experts had looked at ocean absorption of carbon dioxide as a good thing --- because in releasing CO into the atmosphere we warm the planet, and when CO is absorbed by the ocean, it reduces the amount of greenhouse warming．”

1．The ocean is becoming more acidic due to __________．

       A．the lower water pH value                      B．the warming atmosphere

       C．the higher level of CO in the air          D．the increasing use of oil fuels

2．According to Dr Caldeira, __________．

       A．ocean absorption of carbon dioxide is a good thing

       B．more oil fuels will be used in the near future

       C．scientists may predict climate changes with computer models

       D．the future situation of the amount of acidity is extremely serious

3．If the water’s acidity level keeps rising, __________．

       A．ocean life whose structures contain calcium carbonate may be affected

       B．the waters’ pH value will become higher and higher

       C．organisms living near the surface are more sensitive to pH changes

       D．some disastrous events will occur more often than before

4．Most experts once believed storing carbon dioxide in the ocean would reduce __________．

       A．the COabsorbed by the ocean             B．the amount of greenhouse warming

       C．the acidity of the ocean                        D．the gradual release of CO

5．The purpose of this passage is to __________．

       A．show people the findings of a research team

       B．inform people of how acid the ocean is now

       C．introduce Dr Caldeira and his team’s research

       D．warn people of the higher level of CO