18.D [make a sensible choice做出理性选择。sensible理性的,故选D。active活跃的;potential潜在的;wrong错误的。]
19.B [have the right of有权……,故选B。dream梦想;opinion意见;adventure冒险。]
20.C [当人们卖贴有机标签的产品不符合USDA标准时将被罚款11 000美元。fine罚款,故选C。award酬劳,酬谢;give给予;spare节约。]
Ⅱ.
Cheetahs(猎豹) are the
land creatures in the world.Why would a cheetah need to be able to
so ? The only animal that comes close to the cheetah’s
speed is its best favorite food,the gazelle(瞪羚).In order to catch up
a meal that’s as swift as the wind,the cheetah
to develop the ability.It must run as fast as,or faster ,the gazelle.Otherwise,it will face starvation.Cheetahs are
excellent example of the effects of natural selection.There
several species of large cats in the world,but none of them can match the speed of the cheetah.
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