单选题When have annual carbon emissions quadrupled?A Since the late 18th century.B Since the mid-20th century.C Since the 1950s.D In a recent 12-month.

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单选题

When have annual carbon emissions quadrupled?

Since the late 18th century.

Since the mid-20th century.

Since the 1950s.

In a recent 12-month.

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Since all the goods have been cased up according to the S／C, it would be too late to make a change even if we agreed to.(英译中)

参考答案：由于所有的货物已按照售货合同装入箱内，即使我们同意，现在再来改变包装也太晚了。

第2题：

Scientists say it may be five or ten years _____ it is possible to test this medicine on human patients.

(A) since (C) after

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第3题：

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—??____________I was five.

A. Until B. Since C. When D. Before

正确答案：B

第4题：

Attendance at football matches have dropped（）since the coming of television.
off

答案：

解析：

drop off“逐渐减少（小）”。句意：自从电视出现以后，到现场看足球比赛的人数逐渐减少。drop的其他搭配：drop in“顺便访问”；drop out“退出，脱离（比赛等）”；drop down“卧倒；顺着（河流、山坡等）向下移动。”

第5题：

The origins of human speech remain a mystery,__________ we have a fairly accurate idea of when writing began.

A．once
B．if
C．though
D．since

答案：C

解析：

考查连词辨析。句意为“我们对于写作的起始有了相当准确的观点，演讲的。起源仍然是个谜团”。根据句意．前后表转折．故选C。

第6题：

It is already twenty years ____ we ____ to know Mr. White in Paris.

A. after … got

B. after …have got

C. since … got

D. since …have got

答案：C

第7题：

If your asphalt barge has operated more than 12 months in saltwater in the 24 month period since it was last dry-docked，when is it required to be hauled out again ________．

A.12 months since last dry-docking

B.18 months since last dry-docking

C.24 months since last dry-docking

D.36 months since last dry-docking

正确答案：D

第8题：

___________

A] when

[B] since

[C] for

[D] whereas

正确答案：D

第9题：

The origins of human speech remain a mystery,__________ we have a fairly accurate idea of when writing began.

A. once
B. if
C. though
D. since

答案：C

解析：

考查连词辨析。句意为“我们对于写作的起始有了相当准确的观点，演讲的。起源仍然是个谜团”。根据句意.前后表转折.故选C。

第10题：

Ever since the drivers' strike started, citywide buses have been ( ) running thirty minutes to one hour late.

A. finally

B. constantly

C. concurrently

D. very

答案：B

解析：

单选题When have annual carbon emissions quadrupled?A Since the late 18th century.B Since the mid-20th century.C Since the 1950s.D In a recent 12-month.

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