Do you know why different animals or pests (害虫) have their special colors？Colors on them seem to be used mainly (主要地) to protect themselves.
     Some birds like eating locusts (蝗虫), but birds cannot catch them easily.  Why? Because locusts change their colors according to the colors of crops (庄稼).  When crops are green, locusts look green.  But as the harvest time comes, locusts change to the same brown color as crops have.  Some other pests with different colors from plants are easily found and eaten by others, so they have to hide (隐藏) themselves and appear (出现) only at night.
     If you study animal life, you’ll find the main use of coloring is to protect themselves.  Bears, lions and other animals move quietly through forests.  They cannot be easily seen by hunters (猎人).  This is because they have colors much like the trees.
     A kind of fish in the sea can send out a kind of very black liquid (液体) when it faces danger.  While the liquid spreads out, its enemies (敌人) cannot find it, so it can escape (逃跑) at once.  That is why it can live long, though it is not strong at all.

1. From the passage we learn that locusts _______.
A. are small animals
B. are easily found by birds
C. are dangerous to their enemies
D. change their colors to protect themselves
2. How can pests with different colors from plants keep out of danger?
A. They run away quickly.
B. They have the colors much like their enemies.
C. They hide themselves by day and appear at night.
D. They have to move quietly.
3. Bears and lions can keep safe because _______.
A. they have the colors much like the trees
B. they move quietly
C. they like brown and grey colors
D. they live in forests
4. Why can the kind of fish live long?
A. Because it is very big and strong.
B. Because it can send out a kind of very black liquid to help it escape from its enemies.
C. Because it can send out a kind of liquid to kill its enemies.
D. Because it swims faster than any other fish.
5. Which is the best title(标题) of this passage?
A. The Change of Colors for Animals and Pests.
B. Colors of Different Pests.
C. The Main Use of Colors for Animals and Pests.
D. Some Animals and Pests.

     Being safe (安全的) at school and in your everyday life needs knowledge (知识). If you remember the
following information, your life will be much safer.
     Always notice the environment (环境) around you. You shouldn't walk alone (独自) outside. Make sure
where the public phones are. If anything dangerous happens, you can find them quickly.
     Don't use earphones (耳机) when running in the schoolyard or on the street. You will keep yourself from
the outside world and can be easily surprised.
     School bags should be carried (携带) towards the front of your body instead of (而不是) putting them
on your back. When buses are crowded, it is easy enough for thieves to steal the things in your bags on your
back.
     If you are followed by a stranger, cross the street and go in the other direction (方向), let the stranger
know that you know he or she is there. Next, go and get help from others if it is necessary. Don't go home
directly. You are safer in the street than you are in your home or in a lift.
     If you have to take a bus to a place far away, try to get to the stop a few minutes before the buses leave.
This prevents (阻止) a stranger from studying you. On buses, don't sit alone (独自), sit behind the driver or
with friends. Don't sleep.
      Don't play with matches (火柴) or candles (蜡烛), because it may cause fire. If your house catches fire
and you have to escape (逃跑) through smoke, move on your hands and knees with your head 30 to 60
centimetres (厘米) above the floor. Please remember there is cleaner, cooler air near the floor during the
fire.

1. You'd better ________ when you are alone to take a bus.

A. sit in the back of the car
B. sit in front of the car
C. sleep
D. sit after the driver

2. It's ________ for you to use earphones when you are running outside.

A. bad
B. good
C. important
D. necessary

3. You should ________ when you are outside by yourself.

A. find your friend
B. remember the things round you
C. phone your friend
D. get help from others

4. You should put your things ________ when there are too many passengers on the bus.

A. in front of you
B. beside you
C. on your back
D. behind the conductor (司机)

5.  When you are followed by a stranger on your way home, you should ________ to protect (保护) yourself.

A. run home quickly
B. find a lift and go in
C. turn back and walk towards him or her directly
D. let him or her know that you know he or she is there