[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]Guest: Oh, I hadn't realized how late it was. I'm afraid I'll have to be going. Host: Oh, not yet. I'm just going to make some coffee. Guest: ______ , though I'd really love to stay. I've got to be up by six tomorrow morning, unfortunately. Thank you for a wonderful party.

正确答案 ：A

I'm sorry, but I must

解析：解析：主人诚心挽留，客人坚持要走。由于不能接受主人的好意，客人应表示歉意，故而选择A．I'm sorry，but I must比较合理。其他选项使用场合不当。

[单选题]Which of the following statement is TRUE according to this passage?

正确答案 ：D

Not only foreigners but also native people wanted to book rooms for Games.

解析：解析：A和B选项与事实不符，属于错误答案；C选项也被否定，原因是文中说北京饭店并不接受提前这么长时间的预订，而只是记下预订人的姓名。D选项可以在文章中找到出处：“... the hotel had already received 50 to 60 such phone calls from would-be game-goers gambling on the result．Domestic callers have mainly come from the southern provinces of Guangdong and Fujian.”

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