不饱和脂肪酸大多为顺式结构,只有极少数为反式结构。
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自然界中的单不饱和脂肪酸的双键的位置一般在第9~10碳原子之间。
A. 对
B. 错
______with the size of the whole earth,the highest mountain does not seemhigh at all.(1990.1.CET-4)
A. When compared
B. Compare
C. While compared
D. Comparing
In reading stories we anticipate what is to come ______on our memory of whathas gone before.(1995.1.CET-6)
A. Based
B.basing
C. to base
D. to be based
______at in this way,the present economic situation doesn't seem so gloomy.(2000.TEM-4)
A. Looking
B. Looked
C. Having looked
D. To look