Do you know why different animals
or pests(昆虫)have
their special colors? Colors in them seem to be used mainly to protect
themselves.
Some birds
like eating locusts(蝗虫), but birds cannot easily catch them. Why? It is because locusts
change their colors together with the change of 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 themselves for lives and appear only at night.
If you study
the 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 the colors much
like the trees.
Have you ever
noticed an even stranger act? 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 over(散开), its enemies(敌人)cannot find it. And it
immediately swims away. So it has lived up to now 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 gray
colors D.
they live in forests
4.Why can the kind of fish live up to now?
A. Because it is very
strong.
B. Because the liquid it sends
out can help it escape from its enemies
C. Because the liquid it sends
out can kill its enemies.
D. Because it swims faster than
any other fish.
5.Which is the best title for this passage?
A. The Change of
Colors for Animals and Pests B. Colors of Different Animals and
Pests
C. The Main Use of Colors for Animals and Pests D. Some Animals and Pests