Scientists are warning that ________ emissions of carbon (碳排放) are cut, we could be heading for an environmental disaster.
A．beforeB．a(chǎn)s
C．unlessD．in case
C
C 考察連詞。Before在…之前；as因為，由于；unless除非，如果不；in case萬一，假使；句義：科學(xué)家警告說如果碳排放不下降，我們會面臨環(huán)境災(zāi)難。根據(jù)句義和邏輯關(guān)系可知C正確。
練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源：不詳 題型：單選題

The agent was about to sign his name to the document ________，to our surprise，a stranger broke in to prevent him.
A．whileB．when
C．a(chǎn)sD．until

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

Beijing is ranked first in terms of traffic jams and expenses for culture ________ Guangzhou is more open to peasant workers than Beijing and Shanghai.
A．whenB．since
C．whileD．because

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

—I don't mind how you do it ______ you finish the painting on time.
—OK, I see.
A．a(chǎn)s well asB．a(chǎn)s far as
C．a(chǎn)s long asD．a(chǎn)s fast as

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

It will be another 50 years ______ our country is expected to reach the level of a medium developed country.
A．sinceB．before
C．thatD．when

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

—I think George doesn't really care for TV plays.
—Right, ________he still watches the program.
A．a(chǎn)ndB．but
C．orD．so

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

________ I saw the beautiful­decorated house, I really wondered how she could manage that all by herself.
A．WhileB．When
C．As long asD．Now that

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

_______ didn't attend the lecture yesterday won't be given full marks.
A．Any oneB．Whoever
C．WhoD．The person

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

There will be no going back                  our decision is made.
A．untilB．unlessC．onceD．before

查看答案和解析>>

同步練習(xí)冊答案