蜗杆的车削与车削梯形螺纹很相似，但由于蜗杆的（）较深，切削面积大，车削时比车削梯形螺

A primary school bus driver stopped the bus in a gas station in Ohio because he had to use the bathroom. Instead of turning off the engine (引擎) and taking the key with him, the driver left the bus running. And he forgot to set the brake (制动器) because he was in a hurry. “It was cold outside, and I didn’t want the kids to get cold while I was using the bathroom,” he told a police officer.

The bus slowly started moving away from the gas station. As the bus picked up speed, the kids began shouting and crying. Ten-year-old Jake ran forward to the driver’s seat and held the steering wheel (方向盘). He pressed hard on the brake pedal (踏板) and managed to stop the bus as it came nearer to a river bed. Jake turned off the engine at last. After the police arrived at the scene, they praised Jake for his great effort.

“That is one cool kid,” said the police officer. “I told him he would make a great police officer when he grew up.”

Jake wasn’t impressed with what he had done. “Stopping the bus,” he said, “was easy compared to playing Grand Theft Auto III,” his favorite action video game. The bus driver was taken to the police station. He was at first charged (指控) with “leaving a child alone while motor is running.” The lawyer said he hoped to upgrade the charge because of the number of children (twenty) on the bus.

“Whatever he is charged with,” the police officer said, “I will see that he never drives a bus again.”

小题1:Why didn’t the driver turn off the engine when he went to the bathroom? Because _________.

A．he was in a hurry

B．he forgot to do it

C．he didn’t want the kids to get cold

D．he thought he would be back in a minute小题2:What is the correct order?  _________

a. The bus started moving.

b. Jake turned off the engine.

c. Jake held the steering wheel.

d. The kids began shouting and crying.

e. Jake ran forward to the driver’s seat.

f. Jake pressed hard on the brake pedal.

A．a-b-c-d-e-f

B．a-d-e-c-f-b

C．d-a-c-e-f-b

D．d-e-a-b-c-f小题3:What do we know about Jake?   ________

A．He could drive.

B．He was eleven years old.

C．He wanted to be a police officer.

D．He liked playing Grand Theft Auto III.小题4:What does the underlined word “upgrade” mean in the fourth paragraph?  __________

A．改变

B．取消

C．加重

D．减轻小题5:What will most probably happen to the bus driver? He will_______.

A．not be charged

B．face the most serious charge

C．not be allowed to drive a bus again

D．only be charged with “leaving a child alone while motor is running”

“太阳从西边出来”所描述的是一个______事件．

市场定位是目标市场营销的基础。

研究证实，脑缺血超早期治疗的时间窗为

A．6小时之内

B．12小时之内

C．24小时之内

D．48小时之内

E．72小时之内

保尔最终去了哪里？