学位英语

41. Careful observations and systematic studies of sunspots

A. were made by ancient astronomers.

B. started in the early 17th century.

C. were made by Galileo only.

D. could be made without a telescope.

42. Sunspots are cooler than the rest of the sun’s surface because

A. they produce less energy.

B. they are buried in the sun.

C. they are far away from magnetic fields.

D. they are close to magnetic fields.

43. The leading spot and the following spot are the names of

A. two large sunspots.

B. a large spot and a small spot.

C. the two spots in a spot pair.

D. the central core and the ring aroundit.

44. If an intense sunspot activity had occurred in 1857, the next one would have been in

A. 1858. B.1862.

C. 1865. D.1868.

45. In the last paragraph the word “persistent” means

A. important. B.effective.

C. enduring. D.visible.

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