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time.A.IfB.BecauseC.Though【答案】A【解析】句意:——謝謝你告訴我這么多關于自然的知識。(引導時間狀語從句);B. 在……之后(引導時間狀語從句);……時候(引導時間狀語從句);(引導時間狀語從句)?!?5.Remember to keep the dog on a leash (狗鏈)________ you walk it, honey!Sure. I won’t let it hurt others.A.until B.after C.while D.since【答案】C【解析】【詳解】句意“寶貝,當你遛狗時記得給狗拴上鏈子。since自從;if如果;unless除非,如果不;until直到…時候。根據(jù)I made a lot of American friends我交了很多美國朋友,可知是在美國的時候,故選A??疾檫B詞辨析。根據(jù)句意,故選C。12. ______ Mike didn’t win the race , he was still wearing a smile on his face.A.If B.Since C.Although D.Because【答案】C【解析】【詳解】句意:雖然邁克沒有贏了比賽,但是他臉上仍然帶著笑容。A.Unless除非,相當于if not,表條件;B.When當……的時候;C.If如果,表條件;D.Since自從。11.I enjoy fresh air so always sleep with the window open ______ it is really cold.A.unless B.when C.if D.Since【答案】A【解析】【分析】【詳解】句意:我喜歡新鮮空氣,因此我總是讓窗戶開著,除非真的很冷??疾閯釉~時態(tài)。10.Today’s young people can’t live without smart phones. They keep their hands on the phones whenever they go, even while they_______meals.A.had B.will haveC.are having D.were having【答案】C【解析】【詳解】句意:今天的年輕人沒有智能手機就活不下去。9.Now most families have only one child _____ our country’s onechild policy.A.so B.because C.because for D.because of【答案】D【解析】【詳解】句意:由于我們國家的獨生子女政策,現(xiàn)在大多數(shù)家庭只有一個孩子。結合語境可知,本句主語描述的是將來某時進行的動作,故用一般將來時態(tài)。 is D.isn’t。 is B.doesn’t。故選B。A. If如果;B. Unless除非;C. Or否則;D. But但是。根據(jù)語境“我們會輸?shù)舯荣?,除非我們盡最大努力”可知,正確答案是 A。除非我們盡力而為,否則我們會輸?shù)舯荣悺l lose the game we try our best.A.unless B.if C.until D.since【答案】A【解析】【詳解】句意:——戴夫,我們開始訓練籃球比賽吧。6.—Dave, let39??疾闋钫Z從句;since 自從,引導時間狀語從句;unless 除非,引導條件狀語從句;though 雖然,引導讓步狀語從句;because 因為,引導原因狀語從句。5.Life is