单项选择题
All metals are found not to conduct electricity equally well.
A.人们发现,并不是所有金属的导电性能都一样好。
B.人们发现所有金属不能同等用来导电。
C.所有金属被发现不能同样好地发电。
D.人们发现的所有金属并不都是为了很好地发电。
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单项选择题
Other people can remember things () when they have said them over and over.
A.firmly
B.quickly
C.slowly
D.easily
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单项选择题
There is much work to be done () we remember something forever.
A.after
B.when
C.unless
D.before
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