磷脂极性头部是带正电荷的，因此它可以直接与带负电荷的氨基酸残基直接相互作用。
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尿中酮体包括
A. 乙醇
B. 丁醇
C. 丙酮
D. 乙酰乙酸
E. β-羟丁酸
Cross the Fifth Avenue, and you will find the cafe_____ the right.
A. on
B. in
C. from
D. of
Remember to look left and right when you go_____ the street.
A. over
B. across
C. cross
D. past
The post office is_____ the gas station_____ the park.
A. on, of
B. in, of
C. among, and
D. between, and
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