Earth getting darker as sunlight decreases

In a recent report, scientists (0) C that the Earth is getting darker because of pollution in the atmosphere. The reason for this (1)___________ apparent in 2001 when flights in the US were grounded for a few days and scientists (2)_____________ thatdays were brighter and nights were cooler. It is thought that pollution is (3)_____________ for this. Sunlight is reflected back into space after hitting particles created by car fumes, aerosols and aeroplanes.

Scientists (4)___________ that this phenomenon may have(5)__________the climate from becoming even warmer. They also believe that when anti-pollution laws (6)____________ into effect, the speed at which the world's climate changes will (7)____________. To the surprise of scientists (8)__________ theworld, hundreds of instruments recorded a drop of around per cent in the amount of sunshine which was (9)___________ the surface of the Earth from the late 1950s to the early 1990s.

The (10)____________ on agriculture could be very damaging, since even a one per cent reduction in sunlight is enough to reduce the growth of some crops. The factors that have led to the reduction in sunlight also cause various environmental problems, such as air pollution and acid rain. Some scientists believe that the reflection of heat has (11)__________ the ocean cooler. As a result, less rain forms and this may have played a (12)____________ in changing weather patterns in the last few years.

 

0. A.tell           B.inform         C.claim          D.instruct
1. A.came       В.became       С.got             D.made
2. A.noticed     В.learnt         С.knew          D.measured
3. A.guilty        В.accused     С.suspicious   D.responsible
4. A.advise       В.alert           С.alarm          D.warn
5. A.prevented  В.avoided       С.controlled    D.protected
6. A.go             B.arrive          С.come          D.become
7. A.increase    В.grow up      С.develop        D.hurry up
8. A.over           В.around        С.in               D.through
9.A.arriving       В.touching     С.getting        D.reaching
10.A.effect         В.result          С.change       D.consequence
11.A.caused      В.resulted       С.made         D.got
12.A.piece         В.part             С.effect         D.game