Unit 4 Body language Using language课时作业

Ⅰ.阅读理解

　　A

　　Some new comets (彗星) have been discovered accidentally by amateur (业余的) astronomers.Surprisingly a few bright comets have been discovered with the naked eye (肉眼) by members of the general public.However, a great number of comets are found by comet hunters carrying out telescope searches of chosen areas of the night sky.

　　As the movement of all comets is directed around the Sun and because these bodies brighten as they move towards the Sun, there is a greater possibility for the discovery of a new comet in the skies towards the Sun rather than away from the Sun's direction.This means that searches should be put on the western sky after evening light and on the eastern sky before morning light.

　　From the astronomical point there is no time during the year which is the best for the discovery of new comets.A search can be done at any time providing there is no bright Moon.

　　Studies done on the discovery conditions of comets discovered before show that more comets have been discovered in the morning sky than in the evening sky.Thus the smart comet hunter should make sure that morning activity receives as much if not more attention than any evening effort.

　　In recent times, the use of advanced CCD technology to discover objects close to the Earth will in the future greatly reduce the chances of new comets being found with small telescopes.An example of the new technology is the very successful LINEAR program operating in New Mexico.However, until a similar system is based in the southern half of the Earth there will continue to be chances for the discovery of new comets which come from the south.

　　语篇解读：本文是说明文。文章介绍了观测彗星的要领。

　　1．What are comet hunters advised to do?

　　A．Look away from the Sun.

　　B．Stay where there's bright light.

　　C．Face the western sky in the daytime.

　　D．Turn to the east in the early morning.

　　解析：选D　细节理解题。由第二段中的"This means that searches should be put on the western sky after evening light and on the eastern sky before morning light."可知，早晨太阳出来之前应观测东面的天空。

　　2．What do we know about the time for the discovery of new comets?

　　A．Days when they're close to the Earth are great chances.

　　B．Certain fixed days are best for watching comets.

C．Every day is the same if there's no bright Moon.