Directions: Read the following text. Choose the best word（s) for each numbered blank and m

Directions: Read the following text. Choose the best word(s) for each numbered blank and mark A ,B,t2 or D on ANSWER SHEET I. (10 points)

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.

1. A) blanketed

B) swept

C) covered

D) spread