下列不属于农业活动的是：[ ] A．田地里种植庄稼 B．牧场饲养牲畜 C．海上撒

These days, many students like playing 3Dgames. Do you know what 3D games are like? In most 3D games, game players need to control a character (人物). The character can be a robot or a soldier. Game players usually use the mouse to make the character move around in his own world. Game players can find things such as food and weapons to help them go on with the game. The character can go straight, sit down, turn left, turn right or pick up things in the game.

Some 3D games have many levels(等级). The character needs to finish different goals（目标） for each level. Game players can against their computers, and sometimes they can play with other players online（在线）. It’s great fun to play 3D games. But playing 3D games for long is not good for our study.

小题1:In most 3D games, game players need to _______.

A．control a character

B．find a robot

C．act as a soldier

D．control the computer小题2:How do game players make the character move around?

A．By using the keyboard.

B．By using the mouse.

C．By telling the directions

D．By moving the computer.小题3:In the game, the character can _________.

A．go straight and sit down

B．turn left and turn right

C．pick up things

D．All the aboves.小题4:Which of the following is NOT true according to the passage?

A．Some 3D games have many levels.

B．The character needs to finish different goals for each level.

C．Game players can only play against their computers.

D．Game players can go online and play with other players together.

在图中，光屏上所成清晰的像应是倒立   的实像（选填“缩小”、“等大”或“放大”），该实验现象可以说明   的成像特点（选填“照相机”、“幻灯机”或“放大镜”）。该凸透镜焦距可能为      厘米（选填“10”、“12”、“15”），保持透镜位置不变，当蜡烛向左移动时，应将光屏向   移动才能再次得到清晰的像（选填“左”或“右”）。

在距这段路多少米以内的路段不能停放机动车？

A．5米以内

B．10米以内

C．30米以内

D．50米以内

肋骨先天性畸形常见的类型有

A．颈肋

B．肋骨联合畸形

C．肋骨分叉畸形

D．胸骨畸形

E．以上都是

直径为D的实心圆轴，两端受扭转力矩作用，轴内最大剪应力为τ。若轴的直径改为D/2，则轴内的最大剪应力应为：（）

A.2τ

B.4τ

C.8τ

D.16τ