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  3. Black death that drove Newton from his college and into a momentous discovery, (1)_____ England in 1665. Astronomical records of

Black death that drove Newton from his college and into a momentous discovery, (1)_____ England in 1665. Astronomical records of

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问题     Black death that drove Newton from his college and into a momentous discovery, (1)_____ England in 1665. Astronomical records of the time show that (2)_____ was a year of intense sun-spot activity, and studies of annual tree (3)_____, which are wider when the sun is disturbed (4)_____ that the terrible plague of 1348 was (5)_____ accompanied by an active sun.
    This sounds incredible, (6)_____ we now have evidence that the sun has a direct effect on some of our body (7)_____. Over 120,000 tests made on people in a Black Sea (8)_____ to measure the number of lymphocytes in their blood. These small cells normally (9)_____ between 20 and 25 percent of man’s white blood cells, but in years of great solar activity this (10)_____ decreases. There was a biff drop during the sunspot years of 1986 and 1987, and number of people (11)_____ from diseases caused by a lymphocyte deficiency (12)_____ doubled during the tremendous solar explosion of February 1986.
    Many of the body’s (13)_____ seem to be influenced by sun-induced changes in the earth’s magnetic (14)_____. If this is so, one (15)_____ to find that the nervous system, which depends on electrical stimuli, would be the most (16)_____. A study of 5,580 coal—mine accidents (17)_____ the Ruhr river shows that most occurred on the day following solar activity. Studies of traffic accidents in Russia and in Germany show that these increase, by as much as four (18)_____ the average, on days after the (19)_____ of a solar flare. This suggests that accidents may be (20)_____ a disturbance deeper than a simple decrease in reaction time. These results make it clear that man is, among other things, a remarkably sensitive living sundial.

选项 A、environment
B、field
C、layer
D、shell
答案B
解析 固定用法。根据句意，所填表示"(地球)的磁场"，一般用field
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