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He was almost asleep, ____ with all this hard work.

A、worndown
B、wornout
C、wornoff
D、wornaway
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正确答案:

B

答案解析:

【句意】他干了这么多重活儿,累得精疲力竭,差不多睡着了。

【难点】wearout意为“使疲乏;使厌倦;使耗尽”;weardown意为“使消瘦,使厌烦”;wearoff意为“渐渐减少;消逝”;wearaway意为“消磨,打发,虚度;(时光等)流逝”。

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[C]Proposingahypothesisconcerningpopulationsizeandsuggestingwaystotestit.

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[C]Provethatthedeathratesofanypopulationareneverentirelydensity-independent.

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[C]Presentconceptualcategoriesusedbyotherbiologists.

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