人类认识原子结构的历史中，科学家汤姆孙作出的重要贡献是（）_爱下问搜题

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问题选择题

人类认识原子结构的历史中，科学家汤姆孙作出的重要贡献是（　　）

A．创立了近代原子论

B．提出了原子结构的行星模型

C．创立了现代原子论

D．提出了葡萄干面包模型

答案

A．道尔顿创立了近现代原子论，故A错误；

B．卢瑟福提出了原子结构的行星模型，故B错误；

C．道尔顿创立了近现代原子论，故C错误；

D．汤姆孙提出的葡萄干面包原子模型，故D正确．

故选D．

单项选择题 A3/A4型题

女，60岁。无牙患者，牙槽嵴欠丰满，上下颌弓后部宽度不协调，下颌弓明显宽于上颌弓。

全口义齿人工后牙需要排成反关系的指征是上下颌牙槽嵴顶连线与水平面夹角小于()

A．50

B．60

C．70

D．80

E．90

完形填空

I always think my spoken English is so poor that I can’t communicate with
native English speakers well. So after going to the college, I take as 36 English lessons as I can. 37 I am free, I go to English corners and 38 English lessons and lectures. To my surprise, I can understand most of 39 of the professors who come from Canada, and the USA. However, I haven’t had more 40 to talk to them in English.
Although I 41 English articles out aloud every day, I am not sure if I can make myself 42 by native English speakers. How I hope I can talk to 43 English speakers for a while. I went to the English 44 as usual last night. Surprisingly, there were three foreigners sitting there. There , however, were several Chinese students around them, too. “I must not 45 this chance,” I said to myself.
“Hi, nice to meet you.” I 46 to one of them.
“Nice to meet you too.” He put out his hand. We 47 hands, what a warm hand! Then I 48 myself to him. When I told him that I had 49 English by myself for three years, he said that it was 50 and my English was so good. His words gave me a lot of 51 . At that time he hadn’t had dinner. He asked us if it was rude or 52 to talk to us while he was eating (a) 53 . We, said we didn’t 54 that, only
if he was 55 to talk to us. He smiled and began to eat his supper.

D．suggestions

C．unacceptable

D．unbelievable

A．encouragement

C． responsibility