17.A 鲨鱼是世界上少数从不得癌症和白内障的动物。never“从不”;seldom“很少”;often“常常”;usually“通常”。
18.D 理解其中的原因能帮助我们改善人类的健康。analysis“分析”;research“研究”;study“学习”;health“健康”。
19.A 下一句句首的for表明,本句应与下一句意思一致,即我们对鲨鱼造成的危险要远比它们对我们的大。故应选择A项。
20.D 此处应与后面分句中的kill相匹配,故选D项。bark“吠叫”;escape“逃脱,逃避”;defend“防卫,保卫”;bite“咬,咬伤”。
二、七选五阅读填空(共5小题;每小题2分,满分10分)
Five things ambitious people never say
●“I can’t do this—it’s too hard.”
Ambitious people never limit themselves or undervalue hard work with these words. 1
●“I’m not good enough.”
Ambitious people never say they are not good enough.Saying you are not good enough holds you back. 2 The most successful people in the world are not quitters.They are determined who believe in themselves and their abilities.Be confident and believe in yourself,or no one else will.
●“I won’t make it through the obstacles.”
Challenges and obstacles are tests of your resolve and desire to succeed. 3 They say they will make it because they know better things lie ahead—the sun always shines after the storm.
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