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【单选题】
用薄层色谱法分析时,一般比移值Rf值的可用范围在A.
0.1~0.9
B.
0.2~0.8
C.
0.3~0.7
D.
0.4~0.6
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举一反三
【单选题】When the speaker finished his speech, he was affected to see his speech ________ with cheers and applauses from the audience. [ ]
A.
was met
B.
was welcome
C.
was popular
D.
was greeted
【单选题】David paused to consult his notes, and then _______ with his speech.
A.
proceeded
B.
pursed
C.
pronounced
D.
proposed
【单选题】The mayor was asked to ______ his speech in order to allow his audience to raise questions.
A.
constrain
B.
conduct
C.
condense
D.
converge
【单选题】— Didn't bob get ready for his English speech? — No, he didn't. During his speech, he was very _____. [ ]
A.
excited
B.
womed
C.
nervous
D.
confident
【简答题】The most important _____ of his speech was that weshould all work whole-heartedly for the people. A. element B. spot C.sense D. point
【简答题】The mayor was asked to ________ his speech in order to allow his audience to raise questions. A) constrain B) conduct C) condense D) converge
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