先行性指标包括（）。 A．利率水平 B．GDP C．消费者预期 D．失业率

保险人根据保险合同向被保险人赔偿损失前，由于被保险人的过错致使保险人不能行使代位求偿权的，则后果是（）。

A.保险人依然必须向被保险人承担赔偿责任

B.被保险人不得向保险人行使请求赔偿的权利

C.保险人可以扣减相应的保险赔偿金

D.保险人可以不承担保险赔偿的责任

阅读理解。

     Introductory Chemistry was taught at Duke University for many years by professor Bonk.

One year, two guys took the class and did pretty well on all the quizzes and mid-terms. They

each had a solid A. These two friends were so confident in going into the final that the weekend

before finals week, despite the Chemistry final being on Monday, they decided to go to the

University of Virginia to party with some friends.

     They had a great time there. However, with their hangovers (宿醉) and tiredness, they

overslept all day Sunday and didn't make it back to Duke until early Monday morning. Rather

than taking the final then, they found professor Bonk after the final and explained to him how

they missed the final. They told him they went up to the University of Virginia for the weekend

and had planned to come back in time to study, but they had a flat tire on the way back and

didn't have a spare. So they were late getting back to campus.

     Bonk thought this over and agreed that they could take the final the following day. The two

guys, happily and relieved, studied that night and went in the next day at the time that Bonk had

told them. He placed them in separate rooms and handed each of them a test booklet. He told

them to begin.

     They looked at the first problem which was something simple about solution (溶解). It was

worth 5 points. "Cool," they thought, "this is going to be an easy final". They then turned the page.

They were unprepared, however, for what they saw on it. The question contained only two

words: (95 points) Which tire?

1. The two guys decided to go to the University of Virginia because___________.                  

A. they were afraid of the final

B. there was a party there

C. the final would be held there

D. they thought they can pass the final easily

2. When did they take the final at last?

A. On Sunday      

B. On Monday    

C. On Tuesday      

D. On Saturday

3. From the passage we know____________.

A. the two guys came back to campus late on purpose

B. Bonk wasn't strict with the two guys

C. repairing the flat tire took the two guys a lot of time

D. Bonk didn't believe the two guys' explanation

4. After the final, they_____________.

A. may apologize to professor Bonk

B. must have the same scores

C. wouldn't be confident in their Chemistry

D. would feel happy and relieved

5. From the passage we can get a lesson that____________.                        .

A. he who makes no mistakes makes nothing

B. he is wise that is honest

C. one never loses anything by politeness

D. think twice before you do

在输送温度高或沸点低的液体时，由于其饱和蒸气压（），所以泵允许的安装高度往往很低，有时还会出现负值。

在老油区钻井施工，由于地层压力偏低，井控坐岗人员凭经验可以暂时离开去从事其他工作。（）

波长可变的谐波进气增压控制系统在低速时如何实现波长控制？