问题 单项选择题

吗啡与可待因相区别的鉴别反应是

A.重氮化耦合反应

B.银镜反应

C.三氯化铁显色反应

D.过碘酸氧化反应

E.氧化银氧化反应

答案

参考答案:C

解析: 吗啡有酚羟基,与三氯化铁试液反应显蓝色,可与可待因相区别。

完形填空

The weather is always different from time to time. Sometimes it is sunny, and sometimes it is      . If you ask me which       weather is my favorite, I would       it’s the snowy days, because I can find many things that make me happy in     times.

I can do many fun things when it snows. If I have a friend       me, we will do anything interesting. All we want to do is to sleep on the ground.       snowmen is a good idea, too. I will make a snowman that looks       my friend, and she will make one that is just like me. I will never       snowball fights. It is my favorite thing       when it snows. When we      to fight, our laughs are everywhere.

I love the snowy days because they make me happy. How about you? Do you like it too?

小题1:A. rainy                   B. snow                 C. fine

小题2: A.lots of                 B. a little                C.kind of

小题3: A. speak             B. say                 C. tell

小题4: A. those                 B. that                 C. this

小题5: A.has                     B. with                     C. and

小题6: A. Taking                 B. Playing                 C. Making

小题7: A. at                     B. like                 C. for

小题8: A. know                 B. remember             C. forget

小题9: A. to do                  B. doing                    C. do

小题10:A. start                     B. began                    C. got

单项选择题 B型题