Question

This is a street crossing. There are red and green lights at each corner（拐角）. Drivers must watch the lights carefully.

When there is a green light, the cars may go on. When there is a red light, the cars must stop. They must wait until the red lights change to green. Then they can go on. Sometimes the cars want to make a right turn or a left turn. They can make a right turn when the light is green or（或者） red. But they must wait until（直到）the green light is shining if they want to turn left.

Some people are color-blind(色盲) , they can not see the difference between red and green. These people must not drive, or there will be an accident. We must keep our street safe.

76. Drivers must pay attention to(注意) ______ at each corner of the street crossing.

A. the red light                      B. the green light

C. all kinds of lights                D. the red and green light

77. No one should drive on when_______.

A. the green light shows         B. the red light shows

C. there is a light                    D. the light changes

78. A car can turn right when there is _________.

A. a green light or a red one        B. not only（不但）a green light but also(而且) a red one

C. a green light and not a red one    D. no green light or red one

79. A car can’t make a left turn ______ the green light shines.

A. when                    B. because                    C. if                      D. until（直到）

80. Something may happen to a color-blind man if he_______

A. arrives                 B. walks                C. drives            D. runs

Answer 1

 DBADC