商业汇票管理方面的主要法规有哪些？

若sinx+cosx=1，那么sinⁿx+cosⁿx的值是（　　）

A．1

B．0

C．-1

D．不能确定

解方程：

（1）5（y+2）=2y（y+2）；

（2）2x²-5x+1=0．

以下叙述何者是不正确的：( )

A．人身保险产品开发设计需要考虑的宏观经济环境因素不包括消费者的经济承受能力

B．癌症保险实际上也是重大疾病保险的一种形式，但只对被保险人患恶性肿瘤提供保障

C．年金产品包括累积期间和给付期间两个阶段

D．生命表、寿险产品定价的精算技术、寿险等长期产品的准备金计算等是现代人身保险发展的技术基础

消化性溃疡最常发生在

A．胃小弯侧幽门部
B．胃大弯窦部
C．十二指肠球部
D．胃体和胃底交界处
E．十二指肠下段

When Dave was eighteen, he bought a secondhand car for 200 so that he could travel to and from work more (1) than by bus. It worked quite well for a few years, but then it got so old, and it was costing him (2) much in repairs that he decided that he had better (3) it.

He asked among his friends to see if anyone was particularly (4) to buy a cheap car, but they all knew that it was falling to pieces, so (5) of them had any desire to buy it. Dave’s friend Sam saw that he was (6) when they met one evening, and said, "What’s (7) , Dave"

Dave told him, and Sam answered, "Well, what about advertising it in the paper You may (8) more for it that way than the cost of the advertisement!" Thinking that Sam’s (9) was sensible, he put an advertisement in an evening paper, which read "For sale: small car, (10) very little petrol, only two owners. Bargain at 50. " For two days after the advertisement first appeared, there was no (11) . But then on Saturday evening he had an enquiry. A man rang up and said he would like to (12) him about the car. "All right, " Dave said, feeling happy. He asked the man whether ten o’clock the next morning would be (13) or not. "Fine, " the man said, "and I’ll (14) my wife. We intend to go for a ride in it to (15) it. "

The next morning, at a quarter to ten, Dave parked the car in the square outside his front door, (16) to wait there for the people who had (17) his advertisement. Even Dave had to (18) that the car really looked like a wreck. Then, soon after he had got the car as clean (19) it could be, a police car stopped just behind him and a policeman got out. He looked at Dave’s car and then said, "Have you reported this (20) to us yet, sir\

7（）

A.on 

B.up 

C.it 

D.that