数控机床的外部故障一般是由于外部原因造成的。

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。

Every student has tests when they are at school. But have you ever been so worried about the tests that you can’t fall asleep at night? Have you ever felt sick or had a headache during a test?    小题1:   This worry in your mind can make your body feel bad. You may feel angry, frustrated, scared, or afraid --- which can give you a stomachache or a headache.

   小题2:   Good or normal stress might happen when you are called to answer a question in class or when you have to give a speech. This kind of stress can help you to get things better done.    小题3:  

But bad stress can happen if the stressful feelings keep going over a long time. You may not feel well if your parents are fighting, if a family member is ill, if you are having problems at school, or if you are going through anything else that makes you upset every day.    小题4:  

    小题5:    That means making good decision about how to spend your time. If you are only dealing with school stuff and have no time to play, you can get stressed. Make sure you keep your SELF in mind: Sleep, Exercise, Leisure and Food. If you take care of yourself and get enough sleep and food, and if you exercise and leave time for fun stuff, you will probably be less stressed out!

A．However, there are two different kinds of stress.

B．Can you tell a kind of stress from another one?

C．The best way to keep stress away is to have a balanced life.

D．That kind of stress isn’t going to help you, and it can actually make you sick.E. Since bad stress is harmful for us, you’d better try to change it into good stress.

F. If so, then you know what stress is. Stress is what you feel when you are worried or uncomfortable about something.

G. For example, you may do a better job on your test if the stress pushes you to prepare well before the test.

下列句子中对画线的词语解释没有结合句意的一项是[ ]

A、这是明代的遗民朱舜水客死的地方。（死在他乡异国）

B、鲁达喝道：“咄！你这个破落户！”（这里是“无赖”的意思）

C、我放弃了竞选，我偃旗息鼓，甘拜下风。（这里是指放倒旗子，停止敲鼓）

D、数风流人物，还看今朝。（这里指能建功立业的英雄人物）

Of all the areas of learning the most important is the development of attitudes. Emotional reactions as well as logical thought processes affect the behavior of most people.
"The burnt child fears the fire" is one instance; another is the rise of despots like Hitler. Both examples also point up the fact that attitudes stem from experience. In one case the experience was direct and impressive; in the other it was indirect and cumulative. The Nazis were indoctrinated largely by the speeches they heard and the books they read.
The classroom teacher in the elementary school is in a strategic position to influence attitudes. This is true partly because children acquire attitudes from those adults whose word they respect.
Another reason it is true is that pupils often delve somewhat deeply into a subject in school that has only been touched upon at home or has possibly never occurred to them before. To a child who had previously acquired little knowledge of Mexico, his teacher’s method of handling such a unit would greatly affect his attitude toward Mexicans.
The media through which the teacher can develop wholesome attitudes are innumerable. Social studies (with special reference to races, creeds and nationalities), science matters of health and safety, the very atmosphere of the classroom... these are a few of the fertile fields for the inculcation of proper emotional reactions.
However, when children come to school with undesirable attitudes, it is unwise for the teacher to attempt to change their feelings by cajoling or scolding them. She can achieve the proper effect by helping them obtain constructive experiences.
To illustrate, first grade pupils afraid of policemen will probably alter their attitudes after a classroom chat with the neighborhood officer in which he explains how he protects them. In the same way, a class of older children can develop attitudes through discussion, research, outside reading and all-day trips.
Finally, a teacher must constantly evaluate her own attitudes, because her influence can be deleterious if she has personal prejudices. This is especially true in respect to controversial issues and questions on which children should be encouraged to reach their own decisions as a result of objective analysis of all the facts.

The pupils’ attitudes are NOT influenced by ______.

A．their parents’ persuasion to behave properly

B．their teachers’ attitudes

C．the speeches they hear and the books they read

D．such media as social studies, science matter and classroom atmosphere

如图是用显微镜观察到的人血涂片，下列叙述错误的是  

A．血细胞①②③都有细胞膜、细胞质和细胞核  

B．血细胞中数量最多的是①  

C．人体出现炎症时，②的数量会增多  

D．③的作用是止血和加速凝血

说明数组后，数组元素的初值是

A．整数0

B．不定值

C．逻辑真

D．逻辑假