【单选题】【消耗次数：1】
The reason why he didn’t take the exam was _____ he had an accident on his way to the school.
①
because
②
because of
③
that
④
due to
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随机题目
【单选题】
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①
细胞膜是一个具有特殊结构和功能的半透性膜
②
细胞膜的结构是以脂质双分子层为基架，其中镶嵌着具有不同生理功能的蛋白质
③
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④
细胞膜是接受细胞外的各种剌激、传递生物信息，进而影响细胞功能活动的必由途径
⑤
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②
转运脂溶性或水溶性物质
③
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②
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③
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④
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⑤
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