轿厢内的灯，风机甚至空调的电是从哪里来的？

阅读理解。

     Very few people enjoy exams. I don't, either. And although I tell myself not to worry about them, I always

do! So I am not surprised that my students worry about them, too, even though they usually don't need to.

Because they are afraid of failing. However, since it is hard not to worry at all, we all must try not to worry

too much. Why? Because worrying makes exams worse! How to do this?

     1. Ask the teacher about how to revise and about exam skills- how to work when you are in the exam.

     2. Good students don't wait until the week before an exam. They study all through the year. It is not

possible to learn everything at the last minute. So don't leave it till then!

    3. If you start planning and working for each exam early and you make sure that you understand what

you are studying, then, when it is over, you'll be able to say, "What a good exam that was!"

     4. Take a short rest during your time of work and revision. If your mind is tired, it will not remember well.

Work at the time when you know you will work at your best.

     5. If you are studying in the evening, don't go straight to bed afterwards. Your mind will still be "going

round and round" - thinking too much. Do something else, maybe walk or get exercise. Choose something

that will relax you, and make you think of other things.

    6. If you feel bad, talk to someone about your worries. But don't be too relaxed! Some stress over exams

makes you work hard for them.

1. How does the writer feel about exams?

A. Excited.

B. Bored.

C. Worried.

D. Surprised.

2. Why are the students afraid of exams?

A. Because they are afraid of failing.

B. Because they want to get full marks.

C. Because exams are usually hard.

D. Because they think their teachers will be angry with them they can't pass the exams.

3. Which is NOT mentioned (提到) in the passage?

A. Good students don't wait until the week before an exam.

B. Start planning and working for each exam early.

C. If you don't know how to work for an exam,ask the teach about it.

D. You should sleep well before the exam.

4. According to the passage, if you feel bad, you'd better ______.

A. take a short rest

B. tell someone about your worries

C. walk or get exercise

D. keep busy working and forget your worries

5. The writer of the passage is probably a ______.

A. student

B. teacher

C. journalist

D. scientist

过双曲线x²-y²=4的右焦点F作倾斜角为105⁰的直线，交双曲线于P、Q两点，则|FP|•|FQ|的值为______．

机动车仪表板上（如图所示）亮表示发动机可能机油量不足。

某企业全年营业收入5000万元，按规定可在费用中计提列支的业务应酬费为（）。

A.20万元

B.15万元

C.18万元

D.25万元

被告人周某，男，32岁。被告人周某好逸恶劳，又一心想发大财，于是便打起了歪主意。周某从云南某地出境到达缅甸境内，用6000元人民币向当地的毒贩购买500克海洛因。周某回国后将海洛因分成小包出售，获利1万元。一次周某出售毒品时被查获。经查，周某所贩毒品为假毒品。
请分析：周某的行为是否构成犯罪如构成犯罪，应如何定罪？