恰当的工作范围( )是成功实施工程项目的关键。A．定义 B．变更 C．控制 D．确

植被覆盖度是指单位面积内植被地上部分(包括叶、茎、枝)在地面的垂直投影面积占统计区总面积的百分比。图A示意2001～2010年内蒙古自治区三大统计区域植被覆盖度的年际变化，图B示意这种变化与年降水量和年均温的相关性。据此回答小题。

小题1:图A中曲线①、②、③分别代表

A．森林区、荒漠区、草原区

B．森林区、草原区、荒漠区

C．草原区、森林区、荒漠区

D．草原区、荒漠区、森林区小题2:内蒙古2001～2010年植被覆盖度的变化特点及其与气候要素相关性为

A．与2001年比，2010年内蒙古的植被覆盖度整体呈下降趋势

B．年均温的变化对内蒙古植被覆盖度的影响大于年降水量的变化

C．森林区植被覆盖度的年际变化大小主要取决于年均温的变化

D．草原区植被覆盖度的年际变化与年均温呈负相关，与年降水量呈正相关

资源管理器不能管理与访问的计算机资源是_____。

A．A盘、C盘、打印机、绘图仪

B．桌面上的各种图标

C．连在网络上的计算机

D．连在网络上其他计算机内的显示卡

电磁波的极化方向是指（）

A.电磁波的磁场方向

B.电磁波的电场方向

C.电磁波的传播方向

Lying in the sun on a rock, the cougar saw Jeb and his son, Tom, before they saw it. Jeb put his bag down quickly and pulled his jacket open with both hands, making himself look big to the cougar. It worked. The cougar hesitated, ready to attack Jeb, but ready to forget the whole thing, too.
Jeb took off his jacket, grasped Tom and held him across his body, making a cross. Now the cougar’s enemy looked even bigger, and it rose up, ready to move away, but unfortunately Tom got scared and struggled free of Jeb.
"Tom, No !" shouted his father.
But Tom broke and ran and that’s the last thing you do with a cougar. The second Tom broke free, Jeb threw himself on the cougar, just as it jumped from the rock. They hit each other in mid air and both fell. The cougar was on Jeb in a flash, forgetting about Tom, which was what Jeb wanted. Cougars are not as big as most people think and a determined man stands a chance, even just with his fists. As the cougar’s claws got into his left shoulder, Jeb swung his fist at its eyes and hit hard. The animal howled(吼叫) and put its head back. Jeb followed up with his other fist. Then out of the corner of his eye, Jeb saw Tom. The boy was running back to help his father.
"Knife, Tom," shouted Jeb.
The boy ran to his father’s bag, while Jeb started shouting as well as hitting, to keep the cougar’s attention away from Tom. Tom got the knife and ran over to Jeb. The cougar was moving its head in and out, trying to find a way through the wall. Jeb was making out of his arms. Tom swung with the knife, into the cougar’s back. It howled horribly and ran off into the mountains.

How did Jeb try to hold the cougar’s attention

A．By keeping shouting and hitting.
B．By making a wall out of his arms.
C．By throwing himself on the cougar.
D．By swinging his fists at the cougar’s eyes.

焊、割炬火点，应先开（）阀门，再开氧气阀门调节火焰。