下列哪种运动方法主要增强耐力（）。 A.动作重复次数较少的运动 B.动作重复次数多且

一个多边形截取一个角（不过顶点）后，形成的多边形的内角和是2520°，则原多边形的边数是______．

某村共有耕地600亩、园地200亩、荒地50亩、林地100亩和其他各类土地50亩，该村的垦殖指数为（）%。

A.33

B.50

C.60

D.80

(正面)

(背面)

小题1:Where can you find such a card?

A．a bus station

B．a park

C．a bank

D．a hotel小题2:How many buses can reach the hotel?

A．Two

B．Three

C．Four

D．One小题3:What can a guest do if he gets lost?

A．He can take Bus 507 to the hotel

B．He can wait until the light is green.

C．He can call the hotel at the phone number on the card.

D．He can visit the website.小题4:Which of the following is true?

A．The card can be used to open the door.

B．Open the door when the red light is on.

C．A guest can keep the card when he checks out.

D．If the card is lost, a guest will have to pay for it.

氯胺酮麻醉后引起精神神经影响的原因与下列哪种因素有关（）

A.增加颅内压

B.兴奋大脑中枢

C.作用于外侧膝状体、视辐射和皮质

D.视觉区γ-氨基丁酸受体

E.兴奋脑边缘系统

当运行中的电动机在转速突然下降同时迅速发热时，首先应（）。

A.切断电源

B.检查故障

C.汇报领导

D.继续使用