2012年TOEFL词汇模拟题精选系列二

会计考友

At the heart of a comer's coma lies a nucleus of solid material, typically no more than 10 kilometers across.
The word "heart" is closest in meaning to which of following?
- F+ T/ t8 L3 E+ f7 p(A) center
(B) edge
(C) tail
! `# ?9 R. o5 v5 c3 C, O(D) beginning
6 H- H+ l$ n! T
The most graphic proof that the grand spectacle of a comet develops from a relatively small and inconspicuous chunk of ice and dust was the close-up image obtained in 1986 by the European Giotto probe of the nucleus of Halley's Comet.
8 }. K& e5 }& U' H7 w% d4 I# |The word "graphic" is closest in meaning to which of following?
! B/ ~2 Z5 d: Z" Q, w* j(A) mathematical
# K1 ?) v& L5 j(B) popular
(C) unusual
' ^8 Z2 }" c3 n2 S8 @3 S(D) vivid
2 e/ V; Z. S9 I2 h6 b. ]
403. As a comet's orbit brings it closer to the Sun, first the coma grows, then two distinct tails usually form.
The word "distinct" is closest in meaning to which of following?
(A) visible
$ z  R8 I' s. _) e4 w4 s(B) gaseous
(C) separate
; X; F3 A- e& g- u+ t* M+ S(D) new
) J1 A2 v; Z3 |# j! t1 Y  q
6 [+ ~" @; ?0 h8 M5 R5 g0 o. Pheromones are substances that serve as chemical signals between members of the same species.
" T; f# g5 b) z0 z  T4 U/ @- hThe word "serve" is closest in meaning to which of following?
(A) improve
9 B, h( W/ Q9 z' _' h/ e, m(B) function
7 o; d" [0 ~% o1 b; N(C) begin
(D) rely

. Pheromones are the predominant medium of communication among insects (but rarely the sole method) . Some species have simple pheromone systems and produce only a few pheromones, but others produce many with various functions.
5 c8 a1 c9 e9 E" w7 C( {The word "sole" is closest in meaning to which of following?
(A) obvious
(B) best
(C) only
9 U3 y5 C# S5 B5 P; A) E, J" X(D) final
ADCBC