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. （NEMT2005江苏D篇）

　　　　69. To defend themselves，oak trees use________.

　　　　A. chemical means B. physical means

　　　　C. bitter chemicals D. sandy materials

　　　　70. 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.

　　　　71. What would be the best title for this passage？

　　　　A. Plants and Animals B. How Plants Defend Themselves

　　　　C. Attacks

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