The past 22 years have really been amazing, and every prediction we've made about

D．start

A.within

B.scientists have

C.out what

D.is

Seldom _________ any mistakes during my past five years of service here.

A.I would make

B.would I make

C.did I make

D.I did make

What is said about the over 100 aircraft incidents in the past 15 years？

A．They may have been caused by the damage to the radio systems.

B．They may have taken place during take - off and landing.

C．They were proved to have been caused by the passengers' portable computers.

D．They were suspected to have resulted from electromagnetic interference.

What is said about the over l00 aircraft incidents in the past 15 years？

A.They may have been caused by the damage to the radio system．

B.They may have taken place during take-off and landing．

C.They were proved to have been caused by the passengers’portable computers．

D.They were suspected to have resulted from electromagnetic interference．

There is evidence that man is changing: ______.

A．man has been growing taller over the past 500 years

B．man has got stronger eyes than he ever had

C．man's hair is getting thinner and thinner

D．man's limbs are getting weaker because he tends to make less use of them

The temperature of the world in the past ten years has dropped a little ______.

A．because wind and rain changed the weather

B．the drop in the temperature would have effects on wind and rain

C．because wind and rain did not change the weather

D．the drop in the temperature would not have effects on wind and rain

this could even mean the beginning of another ice age. The effects of such a change in weather on human population of the world would be frightening.

Recent research suggests that the warming trend (倾向) of the past hundred years or so may be coming to an end. During the past ten years, scientists tell us that the temperature of the world has dropped a little. This would have effects on wind and rain in the weather picture.

Scientists believe clouds may be an important factor (因素) in changing the amount of heat on the earth. Another possibility is that man's agriculture and industry ways may affect the natural weather.

The weather of the world seems to be getting ______.

A．hotter

B．colder

C．warmer

D．freezing

For those who do not take breakfast, the good news is that _______. A. several studies have been done in the past few years B. the omission of breakfast does no harm to one’s health C. adults have especially made studies in this field D. eating little in the morning is good for health

Which of the following is NOT true？________

A.The temperature in a greenhouse is as high as that in the atmosphere

B.It has become warmer on the earth now than in the past

C.Gases put into the atmosphere now will affect the earth years later

D.Burning too much coal and oil produces lots of greenhouse gases

It can be concluded that

A.raising the wodd’s temperature only a few degrees w．ould not do much．harm to life on earth

B.lowering the world’s temperature merely a few degrees would lead many major farming areas to disaster

C.almost no temperature variations have occurred over the past decade

D.the world’s temperature will remain constant in the years to come