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问题
判断题
分线接触器闭合时分线讯响蜂鸣器发出警告声。
答案
参考答案：
对
选择题
— What _____ great fun it would be if we could light candles to celebrate his birthday!
— Forget it! The teacher in _____ charge of our dorm won't be happy to see that.
A. /; /
B. /; the
C. a; the
D. a; /
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判断题
关于大脑功能的研究，已经成为现代科学最深奥的课题，也是最难攻克的科学堡垒.
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