19. According to the passage, late seventeenth- and early eighteenth-century
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! K0 ^+ C# W5 f( T2 X+ z9 ]; {# I2 X Chinese records are impor- tant for which of the following reasons?
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(A) They suggest that the data on which the Maunder minimum was predicated ! V/ ^1 b1 K) T
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were incorrect.
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(B) They syggest that the Maunder minimum can- not be related to climate.
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(C) Thcy suggest that the Maunder minimum might be \-'alid only for Europe.
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(D) They establish the existence of a span of unusu- ally cold weather
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worldwide at the time of the Maunder minimum. " K' E5 C9 s! K0 L2 j& t
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(E) They establish that solar activity at the tirne of the Maunder minimum
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did not significantly vary from its present pattern. & f0 w4 w1 O& S; ~
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20. The author implies which of the followine about currently available
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geological and archaeoloeical evidence concerning the solar-activity cycle?
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$ Z; q1 S# F* g7 T' |) a" z3 ? (A) It best supports the model of solar activity described in lines 37-45.
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(B) It best supports the model of solar activity described in lines 45-52. & |1 u% b1 M. |: s% k7 f
- r( u1 `: P% j5 | (C) It is insufficient to confirtn either model of solar activity described
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1 P5 G, ^* {; u' C; j in the third paragraph.
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(D) It contradicts both models of solar activity as they are presented in ) y( j) E/ ?) {8 v
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the third paragraph. 2 x$ E0 o1 t2 C% z6 q/ U
' N e8 }) e* n T: X% A* g3 C. I (E) It disproves the theory that terrestrial weather and solar activitv are / z7 l+ Z" p2 D
& K8 b4 ^& Q' [' {5 Z% k% E2 u linked in some way. % g i2 q' J0 `( a& ]4 o
) A) M# T! n; K3 H9 J' [' s
21. Tt can be inferred from the passage that the argu- ment in favor of the
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1 x0 W( m. \# Q8 |8 q5 }. `. A model described in lines 37- 45 would be strengthened if which of the following
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+ v; S1 D. U( m: `: Y were found ta he tme? 5 ?& b8 ~5 x; ]+ T
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(A) Episodes of intense volcanic eruptions in the distant past occurred in 8 ` I1 A$ i7 J* F- `: z
# _. }& j& t' [0 x$ X cycles having very long periodicities. - V2 ?2 B. r4 D5 @
7 i( X# d% V6 w9 E, h5 L4 c (B) At the present time the global level of thunder- storm activity increases ; f8 ^) `3 u$ _/ ~, j+ e
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and decreases in cycles with periodicities of approximately 11 years. + H! W& O L! K# \% R& Y; i
! l, d. T6 N# L$ r7 n# X( ? (C) In the distant past cyclical climatic changes had periodicities of longer
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than 200 years. 4 `' L, a1 F' B% D# E+ n
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(D) In the last century the length of the sunspot cycle has been known to 0 P X1 h( l% t* M2 D( n, `, b
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vary by as much as 2 years from its average periodicity of 11 years.
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(E) Hundreds of millions of years ago, solar- activity cycles displayed the & a7 P5 `* m e' H: e: K f" V
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same periodicities as do present-day solap-activity cycles. |
发表于 2012-8-15 12:40:43
