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【单选题】
细胞膜结构的主要成分是 ( )A.
蛋白质和脂肪
B.
蛋白质和磷脂
C.
葡萄糖和蛋白质
D.
磷酸和蛋白质
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A.
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B.
two new pen friends
C.
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D.
pen friends of two new
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A.
are surviving
B.
survives
C.
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have survived
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A.
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B.
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D.
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A.
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A.
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A.
on top of that
B.
on top of it
C.
and on top of which
D.
on top of which
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