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 lack teeth and claws. But plants can defend themselves by using both physical and chemical means.
Some plants have their own ways to keep animals away. For example, the leaves of the holly plant have sharp spines (刺) that discourage grass-eating animals. Holly leaves on lower branches have more spines than leaves on upper branches. This is because the lower leaves are easier for most animals to reach.
Some plants, such as the oak tree, have thick and hard leaves that are difficult for animals to eat. Some grasses may contain a sandy material; eating such grasses wears down the animal's teeth.
Many plants also have chemical defenses. Some plants produce chemicals that taste bitter or cause an unpleasant reaction. Some plants may fight against an attack by increasing the production of these chemicals. When a caterpillar (毛蟲) bites a tobacco leaf, the leaf produces a chemical messenger. This messenger sends to the roots the information to produce more nicotine. The higher levels of nicotine discourage the caterpillar.
Many plants depend on both physical and chemical defenses. A certain plant in China, for
instance, has prickly (多刺的) leaves, and each prickle contains poisonous venom (毒液) A single experience with this kind of plant will teach an animal to stay away from it in the future.
小題1:The holly plant has more spines on the lower leaves because most animals________.
A．a(chǎn)re not tall enoughB．like the lower leaves only
C．a(chǎn)re not clever enoughD．can get the lower leaves easily
小題2:To defend themselves, oak trees use________.
A．chemical meansB．physical means
C．bitter chemicalsD．sandy materials
小題3:How does tobacco protect itself against an attack from a caterpillar?
A．Its leaves fight against the attack by physical means.
B．Its roots send a messenger to discourage the caterpillar.
C．Its roots increase the production of nicotine when it is attacked.
D．Its leaves produce poisonous sand to drive the caterpillar away.
小題4:What would be the best title for this passage?
A．Plants and AnimalsB．How Plants Defend Themselves
C．Attacks and DefensesD．How Animals Eat Plant Leaves

小題1:D
小題2:B
小題3:C
小題4:B

小題1:考查考生對因果關系的認定能力。文章第二段This is because the lower leaves are easier for most animals to reach.提供答案。
小題2:考查考生對短文中細節(jié)的識辨能力。答案在文章第三段。
小題3:考查考生對短文中細節(jié)的識辨能力。答案在文章第四段This messenger sends to the roots the information to produce more nicotine. The higher levels of nicotine discourage the caterpillar.
小題4:考查考生擬定標題的能力。文章第一段總領全文，介紹了植物是如何進行自我保護的。
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