Question

Animals can move from place to place, but plants cannot. When an animal is under attack, it can run away or fight back. Plants certainly cannot run away, and they have no teeth or claws. But plants can still protect themselves in both physical and chemical ways.

Some plants have their own ways to keep animals away. For example, the leaves of the hollies(冬青树) have sharp spines (刺) that discourage grass-eating animals. Holly leaves on lower branches have more prickles than leaves on upper branches. This is because the lower leaves are easier for most animals to reach.

Some plants, such as the oak trees(橡树), have thick and hard leaves that are difficult for animals to eat. Some grasses may contain a sandy material，so eating such grasses wears down the animal's teeth

Many plants also have the chemical defense. Some plants produce chemicals that taste bitter or cause an unpleasant reaction. Some plants may protect themselves by increasing the production of these chemicals. When a worm(毛虫) bites a tobacco leaf, the leaf produces a chemical smell.

Many plants depend on both physical and chemical defense. A certain plant in China, for instance, has prickly (多刺的) leaves, and each prickle contains poisonous water(毒液).Only one experience with this kind of plant will teach an animal to stay away from it in the future.

1.What can a plant do when it is under attack?

A. It can protect itself

B. It can run away.

C. It can fight back.

D. It must die.

2.Why do the leaves of the hollies have sharp prickles according to the passage?

A. Because they are lower.

B. Because they are beautiful to watch.

C. Because they stop people from picking..

D. Because they make grass-eating animals stay away.

3.How does an oak tree protect itself?

A. It has leaves with a delicious material.

B. It has leaves with sharp prickles.

C. It has thick and hard leaves.

D. Its leaves taste bitter.

4.What does the underlined word“sandy” mean in Chinese?

A. 含盐的 B. 含沙的 C. 坏掉的 D. 腐烂的

5.Which of the following is TRUE according to the passage?

A. The hollies have thick and hard leaves.

B. The oak trees have leaves with poisonous water

C. A plant has only one kind of way to protect itself, physical one or chemical one.

D. A tobacco leaf produces a chemical smell when a worm bites it.

1.A 2.D 3.C 4.B 5.D 【解析】本文介绍了当植物受到攻击时，它可以通过物理的或化学的方式保护自己。 1.A 细节理解题。根据Plants certainly cannot run away, and they have no teeth or claws. But plants can still protect themselves in...

Answer 1