搜题请搜索小程序“爱下问搜题”
问题
单项选择题
下列属于酸性氨基酸的是
A．亮氨酸
B．组氨酸
C．苯丙氨酸
D．天冬氨酸
E．半胱氨酸
答案
参考答案：D
解答题
一支钢笔的售价为l8.6元，是一支圆珠笔售价的3倍．一支圆珠笔的售价是多少元？
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填空题
用方框中所给单词的适当形式填空。（每词限用一次）
afraid mistake himself death easy
1. I was _______ of being alone when I was young.
2. The old man is too weak to look after ________.
3. Does Lucy often make ________ in grammar?
4. My dog's _______ often makes me sad.
5. I think you can solve the problem ________.
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