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【单选题】
下列函数为偶函数的是A.
f(x)=
B.
f(x)=x|x|
C.
f(x)=
D.
f(x)=
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A.
He handed in the work on time.
B.
He lost his work.
C.
He failed to finish the work last night.
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【单选题】He did the work in a more ________ way and saved a lot of time.
A.
efficiency
B.
efficient
C.
efficiently
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