大陆冰川分布最广的地区是 A．格陵兰岛 B．亚欧大陆 C．北极地区 D．南极地区

一个高是4厘米的三角形与边长是4厘米的正方形面积相等，三角形的底是______厘米．

图中的条形磁铁置于水平桌面上，电磁铁与其在同一水平面上，左端固定并保持水平，当电路中滑动变阻器滑片P逐渐向上移动时，电磁铁的磁性_________，在此过程中条形磁铁受到的摩擦力的方向_________。

The 12—year—old CEO（首席执行官）of a Web site design company will be one of 300 business and political leaders accompanying Canadian Prime Minister Jean Chretien on a trade visit to China in March.

Keith Peiris, who founded Cyberteks Design in June 1999 and now has 25 clients （客户）in North America ,insisted in an interview that he is “just like any other kid.”

He and his father will spend nine days on the Team Canada trip to Beijing ,Shanghai and Hong Kong ,where Chretien aims to showcase the best of Canadian business in the most populous country in the world .

A glance at the complex ,elegant animations （动画）on his www.cybertecks.com site shows the extent of Peiris’ talent . “He doesn’t want to be No.2,”his father Deepal said proudly .

His father ,who is now vice president of operations at Cyberteks ,said , “I am teaching my son what I know .We make decisions together .I haven’t done anything my son disagreed with .He makes the final decision .”

The company has seven offices in the United States and five part—time employees who ,like the Peiris family ,work from their London homes .  

Keith Peiris admitted some potential clients change their minds when they learn his age ,but the well—informed not—yet—teenager tries to ignore them .

“Suddenly ,I’ve been called a whiz kid or geek ,which I am not too happy about .A few people have asked if they should call me ‘mister’, but I stay casual , I am still a kid .

小题1:That Keith Peiris insisted that he is “just like any other kid” shows he is           .

A．proud

B．modest

C．honest

D．excited小题2:Who makes the final decision on operations at Cyberteks Design?

A．Keith Peiris      B．Deepal Peiris         C．Jean Chretien        D．Both A and B.

小题3:According to the information in the passage ,which is the best and fastest way to know more about the Web giant ?

A．We can go to Canada to pay him a visit .

B．We can make an international telephone call to him.

C．We’d better visit his web site—www.cyberteks.com.

D．We can write to his father for the kid’s information.小题4:Which of the following statements is NOT TRUE?

A．Keith Peiris is a Canadian boy .

B．All the employees of the child’s company work at home .

C．The Canadian Prime Minister means to show off Keith’s success during his stay in China .

D．Keith always tries his best to be the best in the field of web site designing .

特布他林（博利康尼）扩张支气管作用的机制是（）

A、选择性兴奋β2受体

B、抑制磷酸二酯酶

C、稳定肥大细胞膜

D、选择性地兴奋β受体

E、阻断m胆碱受体

影响毛坯选择的因素有哪些？