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e led a hard life. 解析 at a time“ 每次,一次 ” ,常與表示數(shù)量的詞搭配使用。 at one time“ 曾經(jīng),一度 ” ,常用于過去時。 Ⅳ. 單項填空 1. The polar region is the________of the polar bear. A. habit B. habitat C. rest D. stay 答案 B 解析 句意:北極地區(qū)是北極熊的棲息地。 habit 習慣; habitat 棲息地; rest 休息; stay停留。由句意可知 B項正確。 2. — When did the Great Wall ________? — In the Qin Dynasty. A. e into being B. e into use C. e into effect D. e into power 答案 A 解析 句意: —— 長城何時形成的? —— 秦朝時期 。 A項意為 “ 形成 ” , B項意為 “ 開始使用 ” , C項意為 “( 制度等 )生效 ” , D項意為 “ 開始掌權(quán) ” 。由句意可知A項正確。 3. Dark glasses are sometimes worn to________the eyes from strong sunlight. A. prevent B. escape C. protect D. guard 答案 C 解析 句意:有時戴上墨鏡,來保護眼睛免受強烈陽光的傷害。 prevent阻止; escape逃脫,免于; protect 保護; guard守護。由句意可知 C項正確。 4. It is said that the Slender West Lake is________. A. worth of visiting B. worth being visited C. worthy a visit D. worthy of being visited 答案 D 解析 句意:據(jù)說 (揚州 )瘦西湖值得參觀。 worth 后可加動詞的 173。ing 形式,主動形式表示被動。 worthy of...值得做 ?? ,后跟 being done。故 D項正確。 5. It’s not easy to clean the brown________ from my jacket. A. sign B. point C. symbol D. spot 答案 D 解析 句意:不容易擦掉夾克上的棕色污跡。 sign標志; point小數(shù)點,要點; symbol象征; spot污點,污垢。由句意可知 D項正確。 6. After his vacation, he was in fine________ both physically and mentally. A. condition B. state C. situation D. shape 答案 A 解析 句意:度假之后,他的身體和精神狀況都很好。 in fine/good condition 身體健康,情況較好; state 前應(yīng)加冠詞 a; situation 環(huán)境; shape 形狀。由句意可知 A項正確。 7. A girl was badly hurt in the accident, ________a kind173。hearted passer173。by,she was sent to the hospital immediately. A. thank to B. thanking to C. thanks to D. thanks for 答案 C 解析 句意:一個女孩在事故中嚴重受傷。多虧一個好心的過路人把她及時送到了醫(yī)院。 thanks to 由于,多虧。 8. I won’t go to his birthday party unless________. A. invited B. inviting C. being invited D. being inviting