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【单选题】
能对观察资料进行定量分析和对比研究的是（）A.
自然情景观察
B.
实验室观察
C.
结构式观察
D.
非结构式观察
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举一反三
【简答题】Please try your best to push the sale of machine tools ________your end.
【单选题】You should try your best ____ your English.
A.
to improve
B.
improving
C.
improves
D.
improve
【单选题】—Why didn’t you try your best to get on the bus? —I tried to , but _______ I could, it started moving ．
A.
． until
B.
． when
C.
． before
D.
． after
【单选题】How do people feel the tension in their local areas?
A.
The national tension influences the local atmosphere
B.
Politicians don't pay enough attention to the local tension
C.
It has different traits compared with the tension in the whole nation
D.
Tension in local areas is less serious than the national one.
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