问题 选择题

若物体m沿不同的路径Ⅰ和Ⅱ从A滑到B,如图所示,则重力所做的功为(  )

A.沿路径Ⅰ重力做功最大

B.沿路径Ⅱ重力做功最大

C.沿路径Ⅰ和Ⅱ重力做功一样大

D.条件不足不能判断

答案

物体m沿不同的路径Ⅰ和Ⅱ从A滑到B,初末位置一样,路径不同,

根据重力做功的特点只跟始末位置有关,跟路径无关得:

wG=mgh,

故选C.

阅读理解

In England people can go to see a doctor nearby when they are ill. When the doctor see them, they usually ask about their troubles and soon give them a prescription(处方) for some medicine.

Usually, when people feel ill, they go to see their doctors. But when they only have a cold, they don’t go to see their doctors. They usually go to the medicine shop to buy some medicine. Only when they are terribly ill, the doctor will go to their houses. In an emergency(紧急), people can call 999for an ambulance. The ambulance can take them to the hospital very soon. When they are in hospital, their friends or families can go to see them at a certain time, but they can’t stay long.

Usually people have to pay for the doctors’ prescriptions. And the price is the same for any kind of medicine. But when children, students, old people or people without jobs go to see their doctors, they don’t have to pay for their prescription.

小题1:When people are ill in England, they’ll ___________.

A.go to see the doctor nearby

B.go to the medicine shop

C.ask the doctor to their houses.

D.call 999 for an ambulance小题2:If people have a cold, they usually __________ .

A.go to see a doctor

B.buy some medicine themselves

C.ask to be in hospital

D.go to the hospital at a certain time小题3:What does the underlined words “ambulance” in the second paragraph mean?

A.救援

B.报警

C.救护车

D.担架小题4:When people without jobs go to the doctors, they _________ .

A.get free medical care at home

B.get free prescriptions.

C.get free medicine in the hospital.

D.get free medicine in the medicine shop.小题5:Which of the following is not true?

A.If people lost their jobs, they’ll get free prescriptions

B.In an emergency, people can call 999 for help.

C.people can see friends in the hospital at a certain time

D.All the medicine has the same price in England.

判断题