已知（x+y+4）2+|x-y-2|=0，则x=______，y=______．

封闭式基金的交易遵循“公平竞价”的原则。（）

下述哪项描述不符合骨巨细胞瘤的表现（）

A.长骨骨端关节面下出现溶骨性破坏区

B.破坏区内出现肥皂泡样骨性间隔

C.骨皮质菲薄向外膨胀

D.骨膜增生不明显

E.病变处不易发生病理性骨折

阅读理解。

     We were on tour a few summers ago, driving through Chicago, when right outside of the city, we got

pulled over. A middle-aged policeman came up to the car and was really being troublesome at first. Lecturing

us, he said,"You were speeding. Where are you going in such a hurry?" Our guitarist, Tim, told him that we

were on our way to Wisconsin to play a show. His way towards us totally changed. He asked, "Oh, so you

boys are in a band (乐队)?" We told him that we were. He then asked all the usual broad questions about the

type of music we played, and how long we had been at it. Suddenly, he stopped and said, "Tim, you want to

get out of this ticket, don't you?" Tim said, "Yes." So the officer asked him to step out of the car. The rest

of us, inside the car, didn't know what to think as we watched the policeman talk to Tim. Next thing we

knew, the policeman was putting Tim in the back of the police car he had parked in front of us. With that, he

threw the car into reverse (倒车), stopping a few feet in back of our car. Now we suddenly felt frightened.

We didn't know if we were all going to prison, or if the policeman was going to sell Tim on the black market

or something. All of a sudden, the pollen's voice came over in a loudspeaker. He said, "Ladies and gentlemen,

for the first time ever, we have Tim here singing on Route 90." Turns out, the policeman had told Tim that

the only way he was getting out of the ticket was if he sang part of one of our songs over the loudspeaker in

the police car. Seconds later, Tim started screaming into the receiver. The policeman enjoyed the performance,

and sent us on our way without a ticket.

1. The policeman stopped the boys to _____.

A. put them into prison

B. give them a ticket

C. enjoy their performance

D. ask some band questions

2. The policeman became friendly to the boys when ha knew they ______.

 A. had long been at the band

B. played the music he loved

C. were driving for a show

D. promised into a performance

3. The boys probably felt ______ when they drove off.

A. joyful

B. calm

C. nervous

D. frightened

失神发作的主要临床特点（）

A.突然短暂的意识丧失，动作停止

B.轻度的肌张力低下

C.脑电图为3Hz的棘慢波发放

D.头颅CT可正常

E.智力发育正常

在一般气候环境中的混凝土，应优先选用以下哪种水泥

A．矿渣硅酸盐水泥
B．火山灰质硅酸盐水泥
C．粉煤灰硅酸盐水泥
D．普通硅酸盐水泥