1、下列原子中,核内有21个中子的是( ).(单选题)
A.
B.
C.
D.
试题答案:C
2、His decision was ______, since he could not see the action from where he was standing.(单选题)
A. arbitrary
B. ordinary
C. casual
D. accurate
试题答案:A
3、—You seem to have known all about the accident.
—_____.(单选题)
A. So I have
B. So I do
C. So have I
D. So do I
试题答案:A
4、若 ,且a+b=3,则 的最小值为( ).(单选题)
A. 6
B.
C.
D.
试题答案:B
5、Which is the best one for preserving food in the following methods?(单选题)
A. Put the food in a cold place.
B. Cook the food well.
C. Dry the food by sun.
D. It is not told.
试题答案:D
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