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一道工序中，在（）都不变的情况下所完成的工艺过程称为一个工步。

A、工人

B、切削刀具

C、加工表面

D、转速

E、进给量

下列说法正确的是

A．苯丙烯的同分异构体（包括顺反异构）共有5种

B．甲苯能使酸性高锰酸钾溶液褪色，而甲基环己烷不能，说明有机物分子中的基团间存在相互影响

C．芥子醇（如上图）能发生氧化、取代、水解、加聚反应

D．将少量某物质的溶液滴加到新制的银氨溶液中，水浴加热后有银镜生成，该物质不一定属于醛类

阅读理解。

                                          A letter to Edward,a columnist (报刊专栏作家)

Dear Mr. Expert,

     I grew up in an unhappy and abusive home. I always promised myself that I'd get out as soon as possible.

Now, at age 20, I have a good job and a nice house, and I'm really proud of the independence (独立) I've

achieved.

     Here's the problem: several of my friends who still live with their parents wish they had places like mine-so

much so that they make mine theirs.

     It started out with a couple of them spending the weekends with me. But now they seem to take it for

granted that they can show up any time they like. They bring boyfriends over, talk on the phone and stay out

forever.

     I enjoy having my friends here sometimes-it makes the place feel comfortable and warm-but this is my

home, not a party house. I was old enough to move out on my own, so why can't I seem to ask my friends

to respect my privacy (隐私) ?

                                                                                                                                                  Joan

                                                       Edward's reply to Joan

Dear Joan,

     If your family didn't pay attention to your needs when you were a child, you probably have trouble letting

others know your needs now.

     And if you've gathered your friends around you to rebuild a happy family atmosphere (气氛), you may

fear that saying no will bring back the kind of conflict (冲突) you grew up with-or destroy the nice atmosphere

you now enjoy. You need to understand that in true friendship it's okay to put your own needs first from time

to time.

     Be clear about the message you want to send. For example, "I really love your company but I also need

some privacy. So please call me before you come over."

                                                                                                                                               Edward

1. We can learn from the first letter that Joan ____.

A. lives away from her parents

B. takes pride in her friends

C. knows Mr. Expert quite well

D. hates her parents very much

2. We can infer from the first letter that ____.

A. Joan considers her friends more important than her privacy

B. Joan's friends visit her more often than she can accept

C. Joan doesn't like the parties at all

D. Joan dislikes the boyfriends her friends bring over

3. According to Mr. Expert, why can't Joan tell her friends her feelings?

A. She is afraid of hurting her friends.

B. She does not understand true friendship.

C. Her family experience stops her from doing so.

D. She does not put her needs first.

4. The second letter suggests that Mr. Expert ____.

A. is worried about Joan's problem

B. wants Joan not to quarrel with her friends

C. advises Joan on how to refuse people

D. encourages Joan to be brave enough

在美国，每年接受治疗的精神忧郁症病人的人数超过200万人，接近中国人口的 10倍，而中国的人口则接近美国人口的10倍。
以下各项如果为真，都有助于解释上述现象，除了

A．中、美两国医学界对何为精神忧郁症的解释不同。

B．考虑到实际收入，和中国相比，美国的医疗费用并不过于昂贵。

C．和中国相比，美国有较好的医疗条件。

D．和中国人相比，美国人有较高的自我保健意识。

早期“程序教学”的设计所依据的心理学原理是（）。

A.行为主义

B.认知心理学

C.人本主义

D.科学主义