閱讀理解專項模擬題Turning Night into Day

　　Computers may one day turn night into day ― with good old， natural sunlight.

　　Giant computer-controlled mirrors may one day move around the earth， reflecting sunlight onto a darkened United States.

　　Two scientists from NASA say that 16 of these mirrors， each about a half mile wide， could reflect the sun’s light would equal about 56 moons.

　　The mirrors would be so high that they could catch the sun’s light as the sun was shining on the other side of the earth. The mirrors would orbit(環繞軌道運行)― thousands of miles high ― at the same speed as the earth spins. That way， the mirrors would always be over the same spot.

　　The computer-controlled mirrors could also be made to tilt(傾斜) slowly， so the reflected sunlight would sweep slowly along the surface of the earth. For example， as night fell， the mirrors could be tilted to light up Boston. Later on， as darkness moved slowly westward， Chicago， for example， then San Francisco could be lit up. The reflected sunlight would allow these cities to save electricity. And in emergencies， such as power-failures or disasters， the mirrors could light up the affected area.

　　However， scientists do not know what effect this man-made daytime would have on plants， animals， and humans. Would it confuse some animals and harm plants that are used to regular day-night cycles? Dr. Allen and Dr. Canady suggest that studies be done to find out what bad effects there might be.

　　1 This passage is mainly about

　　A the effect of the sun’s light on living things.

　　B the study of day-night cycles.

　　C mirror-shaped satellites.

　　D computer-controlled mirrors in space.

　　2 Computer-controlled mirrors would be used

　　A to receive and send TV signals.

　　B to catch sunlight for electricity production.

　　C to reflect heat onto one area of the earth.

　　D to reflect sunlight onto a darkened area of the earth.

　　3 The mirrors would always be over the same place of the earth because

　　A they would orbit at the same speed as the earth spins.

　　B they would be solar-powered.

　　C they would stay high in space.

　　D they would not move.

　　4 The mirrors were placed very high in space so that they could

　　A cover the dark side of the moon.

　　B catch sunlight and reflect it onto the earth.

　　C reflect moonlight onto the earth.

　　D be seen by people everywhere.

　　5 The last paragraph shows that the effects of the mirrors on living things are

　　A obvious.

　　B uncertain.

　　C unimportant.

　　D positive.

　　參考答案：B A B A D