How does foam extinguish an oil fire ？______.A.By cooling the oil below the ignition tempe

A．In a plane

B．On a train

C．On a boat

D．On the underground

听力原文： Technicians are making the last-minute preparations for the launch of the U. S. space shuttle Discovery on a flight to the International Space Station. Flight officials with the space agency NASA are aware of storm clouds near the Atlantic coast launch site in Florida, which could postpone the launch. This is the second shuttle flight since Columbia disintegrated on reentry three years ago, killing all seven astronauts on board. Since then NASA has spent hundreds of millions of dollars to correct design flaw that caused a piece of foam insulation to break off from the fuel tank and puncture Columbia's wing. NASA is launching Discovery despite objections by the space agency's chief safety officer and chief engineer. They say the problems with the foam insulation have still not been resolved. Shuttle astronaut Steve Robinson says he is not worried. "The thing like this happened to every single flight and what's really great -- you remember how much we talked about culture change after Columbia. This is culture change. You are seeing it."

The space agency's chief safety officer ______ NASA's plan to launch Discovery.

A．vetoed

B．sanctioned

C．supported

D．disapproved

A.仅在白天显示的灯质

B.仅在雾天显示的灯质

C.临时灯灯质

D.灯光已熄灭的灯质

听力原文： Generations of Americans have been brought up to believe that a good breakfast is one of life's essentials. Eating breakfast at the start of the day, we have all been told, and told again, is as necessary as putting gasoline in the family car before starting a trip.

But for many people the thought of food first thing in the morning is by no means a pleasure. So despite all the efforts, they still take no breakfast. Between 1977 and 1983, the number of people who didn't have breakfast increased foam 8.8 million to 11.7 million. For those who feel pain of guilt about not eating breakfast, however, there is some good news. Several studies in the last few years indicate that, for adults especially, there may be nothing wrong with omitting breakfast. "Going without breakfast does not affect performance," said Arnold E. Bender, former professor of nutrition at Queen Elizabeth Collage in London, "nor does giving people breakfast improve performance."

Scientific evidence linking breakfast to better health or better performance is surprisingly indicated, and most of the recent wonk involves children, not adults.

(30)

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.

A.how the work does

B.how was the work to be done

C.how does the work

D.how the work was to be done