216. With appropriate banking of the extrafood, the Mandans protected themselves against the disaster of crop failure and accompanying hunger.) w) ~; _5 J7 O! b& z
The word "disaster" is closest in meaning to which of following? p) \4 V7 W* F# s; I: X: K3 w/ A) _0 z
(A) control
0 v; Y- K6 Z8 l6 H" F(B) catastrophe
! w8 s6 ^( Z) ~( {/ Y, P8 u: n(C) avoidance
$ A$ q8 S6 b$ o7 b9 P; t(D) history! {+ [$ C3 @$ c3 @ V( y% ]
+ D) N& B$ {8 B7 p% v
217. Helium nuclei have also been found to be constituents of cosmic rays that fall on the earth (cosmic "rays" are not really a form of radiation; they consist of rapidly moving particles of numerous different kinds) .8 W. _6 O0 O" `- s. M
The word "constituents" is closest in meaning to which of following?- f# ]7 ?: J6 l1 O, Y7 h
(A) relatives
% E. D: n. a* a0 E! H6 N(B) causes: r* [- L$ a% C ?
(C) components
1 ^, j. @. }! S/ k: i% G5 |(D) targets( Y1 [: Z- x; |
4 s2 y" B& C$ q218. Its relative abundance never seems to vary much. In some places, there may be slightly more of it; in others, slightly less, but the ratio of helium to hydrogen nucleial ways remains about the same.0 i& q4 y' [0 t. |2 e* G
The word "vary" is closest in meaning to which of following?
8 u) A. K9 z& G9 G* e(A) mean/ A# `7 `. i6 M6 ]) }
(B) stretch
+ F* I; Y |, _. |(C) change+ w* x* k ~4 Y- t7 H/ r( F, u0 A
(D) include) y8 t: F1 l, v# T0 J# {
; A4 h+ S/ |9 t, i219. However, the amount of helium that could have been produced in this manner can be calculated, and it turns out to be no more than a few percent.
3 A4 s0 t2 V2 D2 ]/ M7 I# |" qThe word "calculated" is closest in meaning to which of following?
. Q& q! J' o; `/ u+ \! g(A) ignored/ M5 n3 Y; ]; r7 G+ |+ U
(B) converted
4 {) K! \4 R$ o. h(C) increased
$ w# q; q# h& j5 C# v(D) determined
" ?" b3 g' a+ R6 q3 F
& {8 ]: j9 e. b* B220. By the time the universe was a few minutes old, helium production has effectively ceased.
% y: K! o7 ^. c! ^The word "ceased" is closest in meaning to which of following?+ u- ]7 u$ c! D
(A) extended
Q- n9 Y/ Z& J& @(B) performed
; v5 R3 U0 J" q4 j' F! h E( E% W(C) taken hold% a7 _" R2 u- X; v% M3 W, a
(D) stopped
: {7 g# N, L! ?8 N4 N& S5 M2 b0 e3 |. u6 G+ s
216 B
% h- b: u; J5 A217 C
% \; S8 ^+ z8 |218 C
4 J+ h3 y2 S* {/ v219 D
# X1 h: M/ u1 w7 u/ v! {" {% |220 D |
发表于 2012-8-14 22:41:43
