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问题 单项选择题 A1/A2型题

在API鉴定系统中，需要在阴性的反应孔中添加锌粉来进一步判断生化反应是否发生的实验是（）

A.葡萄糖氧化实验

B.硝酸盐还原实验

C.β-半乳糖苷酶实验

D.尿酶实验

E.苯丙氨酸脱氨酶实验

答案

参考答案：B

填空题

根据每一句的汉字或首字母的提示，拼写出符合句子意思的英语单词，拼写时注意词形的变化。

1. All of these old persons said that they _____ (经历) the two world wars.

2. The two _____ (官方的) languages in Canada are French and English.

3. My friends Mary and Johnson got married yesterday. I went to their new house and said" _____ (恭喜) on

    your happy marriage!" to them.

4. You can't be r_____ (无礼)t o your dad. What a shame!

5. Can you give me some _____ (信息) about flights to Beijing please?

6. Yesterday the teacher s_____ the students should do with these old books as soon as possible.

7. The 1998 flood has been one of the greatest d_____ that hit China these years.

8. Rains are f_____ in our area during the rainy season.

9. The boy spends all his spare time playing football. He l_____ playing it.

10. We had to f_____ against the strong winds all the way and it took us longer time to get home.

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单项选择题

烷烃的密度随着烷烃分子的增大而增加的，但在（）g/cm3左右时趋于稳定。

A.0.6

B.0.7

C.0.8

D.0.9
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