问题 单项选择题 A1/A2型题

下列不是基托树脂的成分的是()

A.甲基丙烯酸甲酯

B.甲基丙烯酸甲酯均聚粉或共聚粉

C.交联剂

D.阻聚剂

E.无机填料

答案

参考答案:E

解析:基托树脂一般由粉剂和液剂两部分组成,粉剂的主要成分是聚甲基丙烯酸甲酯均聚粉或共聚粉,加有少量的引发剂、着色剂等;液剂的主要成分是甲基丙烯酸甲酯,加有少量的阻聚剂和交联剂。室温固化基托树脂还在液剂中加有少量促进剂,无机填料则是复合树脂的组成成分之一。

单项选择题 共用题干题
阅读理解

阅读理解。

     Walking down a path through some woods in Georgia, I saw a small pool of water ahead on the path.

I angled my direction to go around it on the part of the path that wasn't covered by water or mud. As I

reached the pool, I was suddenly attacked! Yet I did nothing for the attack.It was so unpredictable and

from somewhere totally unexpected. I was surprised as well as unhurt though I had been struck four or

five times. I backed up a foot and my attacker stopped attacking me. Had I been hurt I wouldn't have found

it amusing. And I was laughing.After all, I was being attacked by a butterfly!

     Having stopped, laughing, I took a step forward. My attacker rushed me again. He charged towards me at

full speed, attempting to hurt me but in vain.For a second time, I took a step backwards while my attacker

paused. I wasn't sure what to do. After all, it's just not everyday that one is attacked by a butterfly. I stepped

back to look the situation over. My attacker moved back to land on the ground. That's when I discovered why

my attacker was charging me only moments earlier.He had a mate and she was dying.

     Sitting close beside her, he opened and closed his wings as if to fan her. I could only admire the love and

courage of that butterfly in his concern for his mate. He had taken it up on himself to attack me for his mate's

sake (缘故), even though she was clearly dying and I was so large. He did so just to give her those extra few

precious moments of life, should I have been careless enough to step on her. His courage in attacking

something thousands of times larger and heavier than himself just for his mate's safety seemed admirable. I

couldn't do anything other than reward him by walking on the more difficult side of the pool. He had truly

earned those moments to be with her, undisturbed.

     Since then, I've always tried to remember the courage of that butterfly whenever I see huge barriers

facing me.

1. Why did the writer change his direction while walking down a path?

A. To get close to a butterfly.

B. To look over the bad situation.

C. To escape a sudden attack.

D. To avoid getting his shoes dirty.

2. What made the man feel funny?

A. Making the attacker pause.

B. Being attacked by a butterfly.

C. Being stepped on by his mate.

D. Discovering the energetic butterfly.

3. From this experience the man learned _____.

A. what he should do when faced with trouble

B. people should show sympathy to the weak

C. how he should deal with attacks

D. people should protect butterflies

4. Which of the following words can best describe the butterfly?

A. Careless.

B. Amusing.

C. Courageous.

D. Aggressive.