Once lost,______.A．it is said to get such a change againB．one can never get such a chanceC

What would have happened______, as far as the river band?

A．Bob had walked farther

B．if Bob should walk farther

C．had Bob walked farther

D．if Bob walked farther

The old woman could not .______the terrible noise, and so she closed the windows.

A．bear

B．accept

C．receive

D．hold

We could have walked to the station. It was so near. A taxi______at all necessary.

A．wasn"t

B．hadn"t been

C．couldn"t be

D．wouldn"t be

The valley was______in sunlight, and the children were singing with joy.

A．bathed

B．covered

C．swam

D．surrounded

Everyone should remember it is very important to______the balance of nature.

A．get

B．make

C．keep

D．remain

From the passage we can see that the writer______the Death Valley.

A．appreciates

B．is fearful of

C．dislikes

D．is tired of

What does the author say about straight, horizontal bars painted across roads?

A．They are suitable only on broad roads.

B．They are falling out of use in the United States.

C．They are ignored in a long period of time.

D．They cannot be used successfully to traffic circles.

t has reduced automobile crashes to some roads by nearly 75 percent using a single optical illusion. But stripes, called chevrons(人字形), painted on the roads make drivers think that they are driving faster than they really are, and thus drivers slow down. Now the American Automobile Association Foundation for Traffic Safety in Washington D. C. is planning to repeat Japan s success. Starting next year, the foundation will paint chevrons and other patterns of stripes on selected roads around the country to test how well the patterns reduce highway crashes. Excessive(too great)speed plays a major role in as much as one fifth of all fatal traffic accidents, according to the foundation. To help reduce those accidents, the foundation will conduct its tests in areas where speed-related hazards(danger)are the greatest curves, exit slopes, traffic circles, and bridges. Some studies suggest that straight, horizontal bars painted across roads can initially cut the average speed of drivers in half. However, traffic often returns to full speed within months as drivers become used to seeing the painted bars. Chevrons, scientists say, not only give drivers the impression that they are driving faster than they really are but also make a lane appear to be narrower. The result is a longer lasting reduction in highway speed and the number of traffic accidents.

The passage mainly discusses______.

A．a new way of highway speed control

B．a new pattern for painting highways

C．a new way of training drivers

D．a new type of optical illusion

One of the reasons why some people are not in favor of fairy tales is that______.

A．they are full of imagination

B．they are just invented stories which are far from the truth

C．they are not interesting

D．they make teachers of history difficult to teach

The author s mention of sticks and telephones is meant to suggest that______.

A．fairy stories are still being made up

B．there is some misunderstanding about fairy tales

C．people try to modernize old fairy stories

D．there is more concern for children" s fears nowadays