对燃气供求状况实施监测、预测和预警，就是要预防燃气供求状况发生重大失衡造成的突发事件

甲企业向乙企业购买了一批总价款100万的建筑材料，甲企业支付了60万元，约定其余的40万元在3个月内付清。后甲企业将一台价值30万元的施工设备交由乙企业代为保管。3个月后，几经催告，甲企业仍未支付乙企业40万元贷款。则甲企业要求提取该设备时，乙企业可以将该设备留置以担保货款债权的实现。

下列对慢性扁桃体炎病因的描述哪项是错误的（）。

A.多由急性扁桃体炎反复发作所致

B.因扁桃体隐窝引流不畅，窝内细菌。病毒滋生感染所致

C.因扁桃体增生肥大所致

D.葡萄球菌及链球菌感染所致

E.可继发于白喉等其他感染

我们党的根本宗旨和执政理念的集中体现是( )。

A．全体人民团结奋斗
B．充分发挥人民群众的作用
C．以人为本
D．建设社会主义现代化

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\

12().

A.tell 

B.see 

C.agree 

D.call

结合给定材料，有条理地概述我国在培养创新型人才方面所面临的主要问题。要求：全面，有条理，有层次，字数不超过300字。