[单选题]Science is still ______ of the causes of many kinds of cancer.

正确答案 ：A

ignorant

解析：解析：ignorant可以指“无学识的，愚昧的”，还指“不知道的”；unconscious意为“失去知觉的，不省人事的；无意识的”；conscious意为“有知觉的，意识到的”；informed意为“获悉，告知”。

[单选题]I don't know his address, ______.

正确答案 ：B

otherwise I would write to him

解析：解析：在otherwise或or引导的并列分句中用虚拟语气。此时，otherwise或or引导的并列句相当于非真实性条件句中的主语部分，前一分句暗示了现在的情况，因而在 otherwise引导的分句中要用与现在事实相反的虚拟语气。

[单选题]Jim: I have a pair of tickets for an opera Saturday night. Would you like to go? Cindy: I don't think so. ______.

正确答案 ：A

I'm not too wild about opera

解析：解析：be wild about something表示“对……极为热衷”，符合题意；B．I'm not too interested about opera．介词搭配不对；C．I'm not very excited about opera．和D．I'm not very anxious about opera．语义不符。

[单选题]We can infer by this label that ______.

正确答案 ：A

the medicine could cause some people to feel nervous

解析：解析：B和C选项的内容与原文不符，属于错误信息；D选项内容也不正确，这种药为tablet意思为“药片”，本身并不是液体。A选项的内容可以由短文的最后一个句子“Reduce dosage if nervousness，restlessness，or sleeplessness occurs.”所确认。

[单选题]Medicine Directions

正确答案 ：G

six tablets a day

解析：解析：本题的依据句为“Do not exceed six tablets in twenty-four hours”，意思为“24小时之内(一天)不能超过6片药”，与C选项意思相符。其他选项在文章中没有出处。

[单选题]According to the passage, the first settlers used wood for their utensils and tools because it was ______.

正确答案 ：C

available

解析：解析：注意题干上的信号词utensils and tools，以此为目标可以很容易地找到本题的依据句“Because of the lack of other materials，early settlers were forced to make tools and utensils out of wood.”选择C的原因在于当时十分缺乏其他材料而木材到处都有所以得到采用。available意思为“有，存在”。

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