【名词&注释】
活性炭(activated carbon)、金刚石(diamond)、一般现在时(simple present tense)、一般将来时(simple future tense)
[单选题]下列物质中，硬度最大的是
A. 金刚石
B. 石墨
C. 焦炭
D. 活性炭
查看答案&解析
举一反三：
[单选题]“未见其人，先闻其声”，就能判断来的熟人是谁，主要是依据讲话人的
A. 振幅
B. 音调
C. 响度
D. 音色
[单选题]40．
A. at least
B. at all
C. at once
D. at first
[单选题]28． Teachers think that__________
A. boys and girls both have their special advantages
B. boys are calmer than girls
C. girls are better at sports than boys
D. girls do better in drawing than boys
[单选题]4．Will you _________more sugar _________your coffee?
A. add，up
B. add to，/
C. add，to
D. add up，to
[单选题]25． —I'm afraid the meeting has begun．—Don't worry． It _________ ． until the bell _________．
A. doesn't begin; rings
B. won't begin; will ring
C. won't begin; rings
D. doesn't begin; will ring
[单选题]How long did he stay in the elevator?
A. Twenty-four hours. B． From Saturday to Monday.
B. More than sixty hours. D． From Tuesday to Saturday.
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