问题 选择题

下列叙述中,正确的是(    )

A.在基态多电子的原子中,可以有两个运动状态完全相同的电子

B.在基态多电子的原子中,不可能有两个能量完全相同的电子

C.在基态多电子的原子中,M层的电子能量肯定比L层上的电子能量高

D.如果某一基态原子3p能级上仅有2个电子,它们自旋方向必然相反

答案

答案:C

题目分析:在基态多电子的原子中,不可以有两个运动状态完全相同的电子,故A错误;在基态多电子的原子中,可以有两个能量完全相同的电子,故B错误;在基态多电子的原子中,M层的电子能量肯定比L层上的电子能量高,故C正确;如果某一基态原子3p能级上仅有2个电子,它们自旋方向必然相同,故D错误。

点评:本题考查了原子的结构,属于对基础知识的考查,本题比较容易。

填空题
阅读理解

It’s 2009. You feel sick, so you go to the doctor. She checks your fever, looks at your throat, and asks what you’ve been thinking about lately. When you leave,she gives you some medicine, but also a list of thinking skills that you are supposed to practice daily. She says that the way you think is causing some of your illness.

Doctors and other scientists who study the human mind and try to explain why people behave in the way that do, called psychologists, are starting to believe it. You know that your brain is connected to every part of your body through your nervous system(神经系统). Now scientists have proved that how you think and feel can have an influence on the health of your body.

Stress(压力,紧张) is caused whenever there is a problem or a change in your life. Of course, everybody has stress more or less; nobody’s life is perfect. In fact, stress is necessary. Without stress, we would never learn anything or grow or change. We would probably be bored to death. But too much stress can hurt you. It can weaken your body’s protection so that you are more likely to catch diseases. It can even make you more likely to have an accident.

When you feel stress, your brain sends a message to your body to produce a chemical called adrenaline(肾上腺素). Adrenaline speeds up your breathing and your heartbeat. Today you have a different kind of stress. Problems like endless homework or troubles with your family are the kind of things you can’t fight or run away from, so you don’t use up all that adrenaline. It just stays bottled up inside you, and that’s what can do something bad to you.

What can you do about stress? First, you can try to find ways to change things so you aren’t under so much stress. You can set up a plan to finish homework or go to a doctor or a psychologist to try to work things out with your family or your friends. But sometimes you can’t change a stressful situation. Sometimes you don’t even want to. A big change might be a good change, but it will still be stressful.

The link(关联) between your body and brain works in two ways. Your body can help your mind deal with stress. If you are under stress, you need to take especially good care of your body. It’s important to get enough sleep and eat nutritious meals. Some people take a vitamin-mineral pill every day. Another thing that you can do is daily exercise. If you go walking or do aerobic(需氧的) dancing or work out at the gym, you give your body a chance to burn up some of that adrenaline. Of course, a person who isn’t used to much physical activity should start slowly. Anyone with a continuing physical problem should check with a doctor before staring any exercise programs.

1. A psychologist is a person who may help you with your ______.

A. illness and abilities                                B. thoughts and behaviour

C. mind and nervous system                       D. physical activity and daily exercise

2. Which of the following is TRUE according to the passage?

A. You shouldn’t go to the gym if you are under stress.

B. One can do his homework to burn up adrenaline.

C. Diseases and accidents are caused by stress.

D. Everyone needs stress to improve himself.

3. From the last sentence of Paragraph 5 we can infer that ________.

A. it’s difficult to change a stressful situation

B. it’s not stressful when a good change takes place

C. a big change will cause another stressful situation

D. a stressful situation can’t be changed without any effort

4. What is probably the best title for this passage?

A. The body-Brain Link                             B. The Causes of Stress

C. The Advice on Health                                   D. The Nervous System