【托福词汇】词汇模拟精选(二)

　　托福考试词汇模拟题精选系列(二)

　　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?

　　(a) center

　　(b) edge

　　(c) tail

　　(d) beginning

　　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.

　　the word graphic is closest in meaning to which of following?

　　(a) mathematical

　　(b) popular

　　(c) unusual

　　(d) vivid

　　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

　　(b) gaseous

　　(c) separate

　　(d) new

　　。 pheromones are substances that serve as chemical signals between members of the same species.

　　the word serve is closest in meaning to which of following?

　　(a) improve

　　(b) function

　　(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.

　　the word sole is closest in meaning to which of following?

　　(a) obvious

　　(b) best

　　(c) only

　　(d) final

　　adcbc