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  3. The amount of sunlight reaching Earth’s surface appears to be growing. The phenomenon, which some dub "global brightening", (1)_

The amount of sunlight reaching Earth’s surface appears to be growing. The phenomenon, which some dub "global brightening", (1)_

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问题     The amount of sunlight reaching Earth’s surface appears to be growing. The phenomenon, which some dub "global brightening", (1)_____ scientists with a puzzle. If the (2)_____ is real and global, how long will it last and what are the consequences for climate change, the planet’s water cycle, and other (3)_____ that draw energy from sunlight? (4)_____, the answer might seem obvious: More sunlight reaching the ground in a warming world means that temperatures will get warmer (5)_____. Not so fast, some researchers say. Additional warming would be certain (6)_____ nothing else in the climate system changes. And the climate system is (7)_____ static. Some combinations of changes could reinforce the heating; others could (8)_____ it. Unraveling these interactions and forecasting their course require an accurate accounting of the sunlight reaching the surface and the (9)_____ the surface sends skyward. Moreover, researchers say, measurements of the sun’s strength at Earth’s surface are potentially powerful tools for (10)_____ human influences on the climate.
    Earth’s radiation "budget" (11)_____ an "extremely important parameter that is (12)_____ known", says Robert Charlson, an atmospheric scientist at the University of Washington at Seattle. "It needs to be (13)_____ much better than it is".
    (14)_____ about the amount of sunlight reaching Earth’s surface were first raised in 1974. Researchers from the United States and Israel recorded a 12% drop (15)_____ sunlight over 40 years at a (16)_____ station in the southern Sinai Peninsula. Since then, others have used a variety of techniques to try to track (17)_____ sunlight. Three years ago, for example, a (18)_____ led by Beate Liepert at Columbia University’s Lamont-Doherty Earth Observatory gathered data from ground (19)_____ around the world and found that solar radiation reaching the surface fell (20)_____ 4% from 1961 to 1990.

选项 A、now that
B、in case
C、only if
D、even after
答案C
解析 本题考查上下文语义的连贯理解。上句(Not so fast...)中，研究人员说太阳热量增加不一定使地球温度再次升高，除非地球气候系统一切保持不变。表达这种必要条件关系的选项为only if(只有)。其它项均排除。
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