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问题 单项选择题

限制氨基酸是指( )。

A．氨基酸分较高的氨基酸

B．氨基酸分较低的氨基酸

C．氨基酸分较高的必需氨基酸

D．氨基酸分较低的必需氨基酸

答案

参考答案：D

解析： 食物蛋白质的必需氨基酸组成与参考蛋白质相比较，缺乏较多的氨基酸称限制氨基酸。

单项选择题

Man: I’m frustrated．We’re supposed to do our assignment on the computer, but I have difficulty getting access to the computers in the library. Woman: I understand the way you feel. I’m looking forward to the day when I can afford to get my own. Question. What does the woman mean

A．She can’t finish her assignment, either.

B．She can’t afford a computer right now.

C．The man can use her computer.

D．The man should buy a computer right away.
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填空题

肾上腺的动脉供应分别来自________、________、________、________、________。
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