17. The author focuses primarily on 8 L# h: H, ?! c, F' P4 Z
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(A) presenting two competing scientific theories concerning solar
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7 f# c. f. b/ f' b2 P4 X activity and evaluating geological evidence often cited to support them
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- ~- ~, U/ {( j' m' f* ?$ y (B) giving a brief overview of some recent scientifrc developments
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# b: c* Z( g7 U3 a* _* H in s'olar physics and assessing their impact on future climatological research
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(C) discussing the difficulties involved in linkinl: ter- restrial
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2 s6 p& _2 X, q& O$ q phenomena with solar activity and indicating how resolving that issue " ]/ y. D7 b6 B7 S* W9 Z
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could have an impact on our understanding of solar physics + B; I( D' c' C U
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(D) pointing out the futility of a certain line of sci- entific inquiry 6 R+ ~2 B+ w6 y* [) ?
6 P r" g- ]3 {# w! z into the terrestrial effects of solar activity and recommendine ita 3 K5 E4 B6 A4 g: p! J5 e
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aban- donment in favor of purely physics-oriented research
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(E) outlinine the specific reasons why a problem in solar physics has
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W% h) ~3 Y% n8 q: h not yet been solved and faulting the overly theoretical approach of modern
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physicists.
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8 K7 N+ t& D' p3 B9 s3 A% F/ [/ P 18. Which of th.e following statements about the two models of solar
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activity. as they are described in lines 37-55, is accurate?
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(A) In both modgls cyclical solar activity is regarded as a long-lived
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" \4 T5 N6 A! @6 E$ D( e feature of the Sun, persisting with little change over billions of years.
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4 h0 M0 n5 Q4 u5 B l" z! X (B) Tn both models the solar-activity cycle is hypothesized as being
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dependent on the large-scale solar magnetic field. % f. \ E4 W7 r& `
0 @7 a" F! s! l$ U (C) Tn one model the Sun's magnetic fieid is thought to play a role in 5 R1 {6 L! R* z
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causing solar activ- ity, whereas in the other model it is not. 9 x1 f" D/ f% ~/ E
* W, ~) X/ b1 r: @ (D) In one model solar activity is presumed to be unrelated to terrestrial 5 t0 A# k1 M1 e
$ g3 G, i/ K+ U8 A- }/ @2 N phenomena. whereas in the other model solar activity is thought to have
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2 }6 L, m3 e! u# \, e observable effects on the Earth.
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& y( g' n. N' x3 K' R- H; v) M' t (E) In one model cycles of solar activity with peri- odicities longer than , g6 T+ ]6 }, g$ n: c' O2 q' \) `' O
" f# B- g2 G" j3 I( [ a few decades are con- sidered to be impossible, whereas in the other model
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such cycles are predicted. |
发表于 2012-8-15 12:40:43
