人的红细胞在溶血后只剩下一层细胞膜外壳,称血影。如果将血影中的脂类抽取出来,水平铺展开,则测得脂类面积约为红细胞膜表面的[ ]
A.1/2倍
B.1倍
C.2倍
D.4倍
答案:C
Recently a survey _______ prices of the same goods in two different supermarkets has caused heated debate among citizens.
A.compared
B.comparing
C.compares
D.being compared
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