【題目】______ scientists have learned a lot about the universe, there is much we still don't know.
A.Once
B.Since
C.Though
D.Unless

【答案】C
【解析】句意:雖然科學(xué)家已經(jīng)了解到很多有關(guān)宇宙的知識,但是,對于我們來說,仍然還有很多未解之謎.A一旦;B既然,自從;C雖然;D除非。once和unless表示條件,since表示原因或時(shí)間;though表示讓步或轉(zhuǎn)折,故選c

練習(xí)冊系列答案
相關(guān)習(xí)題

科目:高中英語 來源: 題型:

【題目】— Have you got the results of the final exam?
— Not yet. It will be a few days ______ we know the full results.
A.since
B.after
C.before
D.that

查看答案和解析>>

科目:高中英語 來源: 題型:

【題目】 You _______ feel all the training a waste of time, but I'm a hundred percent sure later you'll be grateful you did it.
A.should
B.need
C.shall
D.may

查看答案和解析>>

科目:高中英語 來源: 題型:

【題目】Where was the man yesterday afternoon?

A. By a lake. B. In a café. C. In a cinema.

查看答案和解析>>

科目:高中英語 來源: 題型:

【題目】Sometimes I act as a listening ear for fellow students ________ what is bothering them.
A.totalkover
B.talkedover
C.talkover
D.havingtalkedover

查看答案和解析>>

科目:高中英語 來源: 題型:

【題目】 (judge) from what he said, he must be an honest man.

查看答案和解析>>

科目:高中英語 來源: 題型:

【題目】I bought a vase yesterday,price is too high.

查看答案和解析>>

科目:高中英語 來源: 題型:

【題目】聽下面一段較長對話,回答以下小題。

1How does the woman feel at first?

A. Happy. B. Nervous. C. Angry.

2Where will the woman meet Jack this afternoon?

A. In the square. B. At the restaurant. C. At the park.

查看答案和解析>>

科目:高中英語 來源: 題型:

【題目】It's requested that all members (present) at the party.

查看答案和解析>>

同步練習(xí)冊答案