“The world's oceans are slowly getting more acidic(酸的),” 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 be greater than anything we have seen over the last several hundred million years.

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 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.”

67. 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

68. 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

69. If the water's acidity level keeps rising, ___________.

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

B. the water's 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

70. 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

第II卷(共一部分，满分40分)

第四部分：写作（共两节，满分40分）

第一节：完成句子（共10小题；每小题1.5分，满分15分）

根据括号内的汉语提示，用句末括号里的英语单词的正确形式完成句子。

71.Quite beyond me is _______________________（怎样解决）this problem.（solve）

72.His _______________（不承认打破了）the precious vase made his father very angry. （admit）

73.If he stays here longer, he__（就会适应吃）such strange fruit by the next month. （accustomed）

74.Most citizens do not object ____________________（禁止吸烟）in public places.（forbid）

75.__________________（我们与生俱来的）is the tendency to love and to be loved.（born）

76.Not only ___________（这项发明被重视）but the inventor was also spoken highly of at the conference. （attach）

77.The great GM project , _____________________（他们为此做出了贡献）, is assessed to lead to the rapid development of modern agriculture. （contribute）

78.Honey, look at your mistake in spelling this word, or you ______________________（就能得到）full marks in this exam. （get）

79.After claiming your baggage tomorrow, you can proceed to ______________________（我站的地方）, right next to the newspaper stand.（stand）

80.___（坚持在一起）your friends through thick and thin that brings you lifelong friends. （stick）

第二节：书面表达（共1题；满分25分）

2010年4月14日7时45分许，青海省玉树县发生了里氏7.1级地震。1700多人遇难，1万2千多人受伤，12所学校垮塌，孩子们无法上学学习。为了帮助孩子们尽早回归学校开始正常的学习生活，你校学生会在下周一的升旗仪式上号召同学捐款、捐书、捐学习用具等。假设你是学生会主席李华，在下周一的升旗仪式上你将代表学生会向同学们发出口头倡议，号召大家积极募捐，以实际行动帮助灾区同学渡过难关。要点如下：

简单介绍灾区的受灾情况；

募捐的理由；

募捐的要求。

注意：

适当增加细节以使行文连贯；

词数：100个左右。

开头已写好，不计入总词数。

Dear schoolmates,

Good morning.

As we know, about 7:49a.m. on April 14, 2010, a Magnitude 7.1 earthquake hit Yushu County of Qinghai Province.

____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

从A、B、C、D四个选项中，找出其划线部分与所给单词的划线部分读音相同的选项，并在答题卡上将该项涂黑。

1.passenger   A. organise      B. adapt     C. slave               D. famous

2.medicine   A. electricity     B. across       C. officer         D. clinic

3.press      A. expect         B. devote     C. variety        D. explanation

4.dial       A. remind              B. animal            C. unit               D. living

5.exist      A. experience     B. examine   C. excite              D. explode

Miss Liu will show you around _______Mount Yuntai, because she has _____ good knowledge of it.

A. the; a            B. a; the              C. 不填；a          D. the; 不填

Jane was asked a lot of questions ,but she didn’t answer ________ of them .

A other                        B any                                 C none                        D some

 How cold it is! We’ve never had ______ this winter.

A. the colder day                B. a cold day                    C. the coldest day        D. a colder day

Napoleon’s story proves that to be a hero has nothing to do with size, ________ with a smart mind and a brave heart.

A. and                    B. so                              C. or                            D. but

 Always read the ______ on the bottle carefully and take the right amount of medicine.

A. explanations       B. instructions                   C. descriptions                D. introductions

Do keep the knife _______ the reach of children.

A. away             B. beyond                C. out                   D. with