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[资料分享] 【SAT每日一】7/23/12 Mathematics > Standard Multiple Choice [复制链接]

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发表于 2012-7-27 22:23:44 |显示全部楼层
Read the following SAT test question and then click on a button to select your answer.
7 B0 G  u/ F# K
; Z7 f1 \3 u) v1 [! z, M4 AIf , which of the following statements must also be true?
* b  B" n9 w% p* L" C3 `) S; u! g
.
( i3 y9 M9 ^9 H
4 v& T2 ?; @' v: b' ?7 ]7 p .
" x8 A- q: C9 L" l
0 m, Q/ v8 ~; v; Y/ ~/ |' Q0 ~& k& H' g
& |, @: G/ Y0 M( J* r7 @* T
. , J% S* |7 o  z8 r4 s/ x/ ~
$ e, O5 \* o5 j# q6 Y) d

8 x. m; m) \' q1 D$ [6 O, G, l1 G
/ w( d$ P1 }5 a; g% H6 z& [
7 T4 `$ i9 l+ e
3 c+ L  V. n; v& @0 Y( J5 pA. None" Q* X. o2 I% K3 h- b

, n, ~' U+ L5 u4 }0 ]6 T5 E$ _B.   only 7 y2 m" ^$ j5 g; @
9 A% f) K/ q+ [& Z$ S5 [# A% w
C.   only
' j- q7 [% {4 v" U2 y6 G% a8 u+ N- p& P; h$ R8 ?
D.   only / Z+ ?8 Q, z* l

( ?1 {/ @2 I7 x9 D9 h7 tE.   and  
+ g; X5 o9 K0 t7 S" k9 x$ g
& S# ?$ [7 I2 v' U" e% j正确答案:E0 F+ \6 `& g. z2 }- E
5 K) }  o( @$ j' `- N( X1 f
解析:3 ?+ `4 K- c% q/ }( A% V

0 U* G0 V. R& G1 rThe quantity   can be expressed as  . 7 \5 Q; d$ O* j; y
If , then  and  . / B9 c% ~( u1 ^
Since  , either   or or both. Therefore,
$ `& E! J' u3 G+ Y. W& s7 a" N! bstatement must be true, but statement , , : s. C  I8 c7 d. Y+ i5 ]* Z! k
is not always true. For statement , you can write
# o  q7 x) ~4 ?( V( |' H7 F* v, and since ,
/ D2 ~  L8 B& l" n& _# {" x, sit follows that .
5 g! q: `" O; ?+ a; j6 e% K0 MTherefore, both statements and must be true.
4 B  [( \9 w; U7 K
: x; C9 H: ~" @$ p* Y. E; W: @% |3 c5 T! u3 D- v4 d/ f: D2 a
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