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问题 单项选择题

脂肪酸合成过程中乙酰CoA来自()

A．三羧酸循环

B．柠檬酸循环

C．丙氨酸葡糖循环

D．丙酮酸苹果酸循环

E．乳酸葡糖循环

答案

参考答案：D

填空题
已知函数f(x)=
x3-1
x-1
，x≠1
a，x=1
，若f（x）在R上连续，则a=______，此时
lim
n→∞
(
an-1
n
+
2a
3n
)=______．
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填空题
选用方框中所给单词的适当形式填空。
iron      dry       satisfy       succeed       check       travel

1. We'll start as soon as our trousers ___________.
2. —________you _______your shirts?
    —Not yet. They are so wet.
3. They tried and tried and finally they ____________
4. We wonder what we can do ________ her.
5. The police ________________the scene for some clues now.
6. My teather told us that sound ________more slowly than light.
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