Some snakes eat other snakes, even poisonous ones. The poison does not do them any harm(傷害). 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（害蟲）, 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.
小題1: Which of the following groups of food is usually had by a snake?
A．Mice, crops, birds’ eggs.
B．Pests, frogs, some animals, plants.
C．Birds’ eggs, frogs, all animals, other snakes.
D．Mice, frogs, pests, some animals, other snakes.
小題2:We should not kill a snake because       
A．it is poisonous
B．it can do something useful for man
C．it will strike you in return
D．we are not experts
小題3:Snakes may do some valuable work by       
A．eating pests, mice and some harmful animals
B．doing harm to other animals
C．eating birds’ eggs and frogs
D．both A and C
小題4:In writing this passage the writer mainly wants us to       
A．have a better impression(印象) about snakes
B．like snakes
C．kill snakes with the help of experts
D．regard snakes as one of man’s best friends

小題1:D
小題2:B
小題3:A
小題4:A

試題分析：提到蛇你會(huì)想到什么？有毒、可怕或者會(huì)傷人？其實(shí)蛇的食物鏈有很多，包括蛇、青蛙鳥(niǎo)蛋，更有老鼠等破壞莊稼的動(dòng)物。從這一點(diǎn)來(lái)看，對(duì)人類還是有益的。它的攻擊大多是出于自衛(wèi)和獵食。那就順其自然吧。
小題1:細(xì)節(jié)理解題。根據(jù)第二段可知，蛇吃其他的蛇、鳥(niǎo)蛋、青蛙、還吃害蟲、破壞莊稼的老鼠和其他動(dòng)物，但是不吃莊稼和植物，也不是所有的動(dòng)物都吃，所以排除其他選項(xiàng)， 選D。
小題2:細(xì)節(jié)理解題。根據(jù)第二段可知，盡管有的蛇吃鳥(niǎo)蛋、青蛙，但是其他的一些蛇會(huì)吃破壞破壞莊稼的動(dòng)物，對(duì)人類有幫助。并不是所有的蛇都有毒害，其他和主題不一致，而B(niǎo)（它能做一些對(duì)人類有益的事。）符合。
小題3:細(xì)節(jié)理解題。根據(jù)Others eat pests（害蟲）, mice and other animals that harm crops on farms.可知，蛇可以做有寶貴的工作，因?yàn)橛械纳叱院οx、破壞莊稼的老鼠和其他動(dòng)物。所以選A。
小題4:主題歸納題。文章介紹了優(yōu)點(diǎn)蛇吃青蛙等，但是還有的蛇以破壞莊稼的害蟲為食，對(duì)人類有貢獻(xiàn)。所以選A。蛇有毒，所以不能把它當(dāng)作好朋友來(lái)對(duì)待。只是對(duì)蛇看法轉(zhuǎn)變而已。
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