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【单选题】
在进行单元测试时，常用的方法是A.
采用白盒测试，辅之以黑盒测试
B.
采用黑盒测试，辅之以白盒测试
C.
只适用白盒测试
D.
只适用黑盒测试
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举一反三
【单选题】Because of climate change, the ice that polar bears depend on for survival .
A.
are slowly disappearing
B.
is slowly disappearing
C.
are slowly disappeared
D.
have slowly disappeared
【简答题】A．They are difficult to read. B．They are slowly falling apart. C．They were not made from wood pulp. D．They should be stored, in a cold place.
【简答题】下列基团极性从小到大排列正确的是( )A. Ar-OH 、 -COOR 、 -CHO 、 -OCH3 B. Ar-OH 、 -CHO 、 -OCH3 、 -COOR C. Ar-OH 、 -CHO 、 -COOR 、 -OCH3 D. C.Ar-OH 、 -OCH3 、 -CHO 、 -COOR
【单选题】which of the following statement is incorrect?
A.
Changes are slowly taking place in all sectors of the British society.
B.
The gap between working -class and middle- class young people is narrowing
C.
different in income will remain but those in occupation will disappear
D.
middle-class people may sometimes feel inferior to working-class people!
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