1.The long-awaited Hubble Space Telescope,____ to orbit the Earth next March, will observe some of the oldest stars in the sky.
A) subject B) owing C) available D) due
答案：D due(to do) 定于(某时做)。subject(to)受……约束。owing to 由于( 状语) 。available可得到的，可获得的。
2.There is something wrong with his vocal chord(声带)and as a result, he has always been____.
A) dumb B) quiet C)silent D)speechless
答案：A 这几个形容词均含有“寂静的，不出声的”的意思。dumb 指由于语言器官有缺陷而不能说话，符合题意。quiet 指既不出声，也不活动，大有宁静之感。silent 语气较强，指抑制住不讲话或不出声，但无宁静之义。speechless 通常措由于吃惊或激动而说不出话来。
3.The curtain is very dirty .When we bent it with a stick, the____ rises in clouds.
A) mud B) soil C) earth D) dust
答案：D 因为意为dust“尘土，灰尘，浮尘”，符合句意。mud 意为“泥土”。soil意为“土壤”。earth意为“(地表的) 泥土”，均应排除。
