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【单选题】
下图虚线所示为层装石墨的一个晶胞，晶胞中包含的原子数为（），C-C键数为（）。【图片】A.
2 ， 1
B.
1,1
C.
2,3
D.
1,3
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【单选题】The young mother is experiencing postpartum depression.This means she is experienceing depression
A.
before her child's birth.
B.
after her child's birth.
C.
during her child's birth.
D.
until her chikd's birth.
【单选题】By 'appear to be choosing leisure over goods' in the last paragraph, the authors means that ______.
A.
Britons like leisure better than choosing quality goods
B.
Britons often enjoy their leisure with quality products
C.
Britons like to have tea in a leisurely way
D.
Britons prefer enjoyment to productivity
【单选题】Facing the economic depression, every possible means ______ this year to save the company from going bankrupt. [ ]
A.
has been tried
B.
has tried
C.
have been tried
D.
have tried
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