58. We know the Goliath beetle is a true insect because it _______.

　　A. makes a whirring sound when it flies

　　B. has both soft and hard wings

　　C. has six legs and a body with three parts

　　D. can fly

　　59. When flying, the Goliath steers by_______.

　　A. turning its soft back wings

　　B. twisting and turning its hard front wings

　　C. twisting and turning its legs

　　D. twisting and turning its whole body

　　B

　　Some snakes eat other snakes, even poisonous ones. The poison does not do them any harm(伤害). Snakes can swallow(吞下) things that are bigger around than they themselves are. This is possible because the jawbones(腭骨) are loosely joined, and the mouth can stretch（伸展）to make room for a fat animal. The snake’s slim body stretches to make space for the animal when it is inside.

　　Many snakes eat birds’ eggs or frogs（青蛙）. Others eat pests（害虫）, mice and other animals that harm crops on farms. Because snakes do this valuable work, you should never kill one. It is too dangerous for you to kill a poisonous one. Leave that job to experts.

　　60. Which of the following groups of food is usually had by a snake?

　　A. Mice, crops, birds’ eggs.

　　B. Pests, frogs, some animals, plants.

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