【正文】 ，表轉折。根據(jù)前半句表示幸虧他，后半句表示我們無法成功地做這件事，因此表示如果沒有他，我們就做不到這件事，故用or,故選A。or否則，如果不這樣；so所以，表示結果；but但是，表示轉折關系；because因為，表示原因解析：A【解析】句意：——吉姆是一個樂于助人的學生。結合句意，故選B。or否則，連接并列句，but但是，連接轉折關系的并列句，and和，連接順承關系的并列句，so所以，連接因果關系的并列句；結合句意可知，譯為否則，故選B。A. 否則，或者；；；。A. 否則，或者；；；?？疾檫B詞辨析，A. and和，表順承；B. then然后；C. so因此，表因果；D. or否則，表遞進，分析句子，結合選項，解析：D【詳解】句意：Jimmy很早就動身去機場了，否則他將趕不上飛機。本題考查并列復合句。本題考查并列復合句。解析：B【解析】試題分析：句意：昨晚我給莎拉打電話，但是沒有回答。根據(jù)題干“這件棕色的夾克衫很好看，但是我穿上不好看”可知，句子前后是轉折關系，故選C。And和、又，表示順延；so因此，表示結果；but但是，表示轉折；解析：C【詳解】句意：——這件棕色的夾克衫很好看，但是我穿上不好看?？键c：考查連詞?？键c：考查連詞。此處上下句表示因果關系，故答案選D。表示結果。表示結果。根據(jù)句意結構，可知選A。本題解析：A【解析】句意：音樂太吵了，所以我拒絕了。結合句意，如果不快點，我們就會晚點，趕不上第一班公交車，故用or，故選D。5．D【解析】句意：快點，否則我們第一班公交車要晚點了。Although盡管，引導讓步狀語從句；So因此，表示結果；Until直到……才，引導時間狀語從句；But但是解析：A【詳解】句意：盡管他過去有200公斤重，但他現(xiàn)在已經通過鍛煉減肥太多。but但是，表轉折；so所以，表結果；or或者，表選擇；and和，表并列。考查連詞辨析。A．And和； B. So因此； C. But但是； D．Or否則，根據(jù)句意是“否則”的意思，故選D。or否則，要不然；and和，表并列；but但是，表轉折；so所以，表結果?？疾檫B詞辨析。 or B．and 。t be afraid to make mistakes， _________ you39。t catch the plane．A．and B．then C．so D．or14．Just leave the key to the exercises behind, you will be dependent on it.A．or B．and C．so D．but15．Mike， don39。s the secret of success, Dr. Know? 一 More time and effort, _________ you’ll make it some day.A．yet B．or C．and D．but24．I love cola and hamburgers, ________ they are not healthy.A．or B．so C．but D．and25．The dress is really beautiful，__________ it is too small for me.A．or B．but C．so D．and26．Hawking is no longer with us, he will continue to inspire the world.A．so B．if C．but D．as27．Bob is young, _______ he knows a lot.A．because B．so C．but D．unless28．I like dancing, ______ I don’t have enough time to practice it.A．or B．so C．but D．because29．To some people living in Shanghai, the face of Shanghai may have changed, ________ the heart of it remains the same.A．but B．and C．so D．or30．It’s not always safe to pay over the Internet, you should be careful.A．so . B．after . C．because . D．as soon as31．You should return the digital camera to Sally ________she will get angry.A．so that B．because C．before D．or32．The shirt looks good on me, ________ it’s a little expensive.A．but B．and C．or D．so33．Many people aren’t attracted to this project, ________ I want to know more about it.A．as B．or C．until D．but34．I like your story, _______ I’m confused by the ending. Can you explain it?A．and B．or C．so D．but35．The F1 driver is hugely talented, ________ he still works hard to achieve his goals.A．so B．but C．if D．though36．The team met a lot of difficulties, ______ they never gave up and won the game at last.A．or: B．and C．but D．so37．Stephen Hawking had a serious illness, _______ he kept studyin