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【单选题】
听力原文：A bank or insurance company issues a document to guarantee that exporter will supply the goods or services as the required standard. (4)A.
A bank or insurance company issues an advance payment bond.
B.
A bank or insurance company issues a tender bond.
C.
A bank or insurance company issues a maintenance bond.
D.
A bank or insurance company issues a performance bond.
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举一反三
【单选题】Why couldn't Karl promise anything?
A.
He didn't want to lend Larry a hand.
B.
Larry's case was too serious.
C.
Larry would be found guilty for sure.
D.
The other members of the jury might not listen to his recommendation.
【单选题】Mr. Smith couldn’t open the door because his naughty boy ______ it from the inside.
A.
would lock
B.
was locking
C.
has locked
D.
had locked
【单选题】在间歇反应器中等温进行一级不可逆反应A→R，当转化率达90％时，所需反应时间为2h若反应改在管式反应器中进行，空时为2h，其它条件同间歇反应器，则转化率为（）。
A.
60％
B.
90％
C.
45％
【单选题】The traffic was making so much noise that I couldn’t hear what he________ .
A.
is saying
B.
was saying
C.
has said
D.
will say
【单选题】在反应体积 1m 3 间歇反应器中等温进行一级不可逆反应 A → R ,当转化率达 90 %时,所需反应时间为 2h ,若反应条件不变,反应体积改为2 m 3, 则 2h时 转化率为( )
A.
60%
B.
90%
C.
45%
D.
75%
【单选题】一 Where have you been all day? — I _____ some former classmates and I couldn't get back until it was dark. [ ]
A.
have met
B.
met
C.
would meet
D.
had met
【单选题】________ enough time, but he couldn’t do it better.
A.
He was given
B.
Given
C.
To be given
D.
Though he was given
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