216. With appropriate banking of the extrafood, the Mandans protected themselves against the disaster of crop failure and accompanying hunger.9 d G. t% ?7 _& _5 g+ p) Z
The word "disaster" is closest in meaning to which of following?- F, R& C1 h9 E& ~5 h$ X
(A) control
" b0 ] Y9 l% f/ W7 H(B) catastrophe, F2 d$ q8 f, O. U7 `! G& D
(C) avoidance0 s* H v0 E. ]% y
(D) history
0 m5 P6 A" J+ M$ y, e0 O% M
+ x8 J; ?# z5 { p4 Q- E. V217. 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) .
! `) w4 o8 [1 \3 s! ^, MThe word "constituents" is closest in meaning to which of following?
6 D0 Y5 w8 }( V! Q5 ?$ F(A) relatives
. u$ k2 [- y) v9 I% e(B) causes
; i; H$ l* G8 c/ m( z; h* }) G(C) components8 F+ R+ T( m9 S& T- k* H
(D) targets
, ]! w _6 ]: P7 U4 w6 T/ C5 E
7 n1 _) }# O5 `5 c218. 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.- s. \+ Y0 S: \( C$ _9 g6 K
The word "vary" is closest in meaning to which of following?% D% I- C2 b7 H+ @: W# j( P
(A) mean; b8 m/ G7 _. t6 x; }! ?6 S8 G$ z
(B) stretch5 B! L2 d, S2 |' p) _: X: o
(C) change
" t+ h3 i/ d) a. k# t# o1 C(D) include
+ m: a. w& e/ F. k! N n1 F2 |. B- c+ L) g) n1 [5 E
219. 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.
, G$ i# q" n" x$ v J' BThe word "calculated" is closest in meaning to which of following?
3 d3 {' O/ }4 \(A) ignored; Z1 G0 n0 }5 K& m
(B) converted+ |1 Z9 p7 k2 p' Y5 j6 I
(C) increased
; ?% N$ D0 M5 I) e(D) determined
* o% ]% E. l2 ~- k$ Q% I- X5 i8 u' B: K4 A6 [
220. By the time the universe was a few minutes old, helium production has effectively ceased.
/ ^* t$ j' x8 s. d) R1 j+ p, ~The word "ceased" is closest in meaning to which of following?: s8 J1 _' |9 v G. V
(A) extended2 l$ m2 L: z, M9 D/ R
(B) performed
2 ]" ~- O1 J* z0 s2 B(C) taken hold
. d2 _5 Z5 o, W l B(D) stopped
- |) i" f: z, h6 g6 Z& z) _. I- ]7 r7 ^/ l: s% |
216 B
' i2 J; _% W# a217 C
# u, \; _, R& S8 ~" N* n1 k7 W218 C
6 ~4 N+ l2 k' F- B9 ^" W219 D& e5 G$ M: F, z0 G
220 D |
发表于 2012-8-14 22:41:43
