题目内容

Because of his heavy workload， he seems to be__________ in strength.

A. lacking
B. shorting
C. needing
D. running

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A. strength
B. efforts
C. energy
D. time

脂酸的______是Knoop于1904年最初提出来的。

通过两分子与一分子反应可以合成一分子磷脂酸。

Alice: Why didn‘t you show up for class this morning？
Ella:. You know， I live far from the school.

A. It" s a fine day
B. My car broke down
C. It" s not the case
D. That" s good