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【单选题】
酶的比活力是指A.
每毫克蛋白的酶活力单位数
B.
任何纯酶的活力与其粗酶的活力比
C.
每毫升反应混合液的活力单位
D.
以某种酶的活力作为1来表示其他酶的相对活力
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举一反三
【单选题】American Indians _________ about five percent of the U.S. Population. [ ]
A.
fill up
B.
bring up
C.
make up
D.
set up
【单选题】I’ll()the exchange rate and service charge and then type up the check for you.
A.
make up
B.
figure out
C.
carry out
【单选题】关于话筒的描述，不正确的是：
A.
动圈式话筒对于环境噪音有较好抑制效果，适用于KTV或演出场合
B.
电容式话筒适用于录音室录音、影视录音、乐器拾音等场合
C.
驻极体话筒音质相对差一些，用于会议话筒、录音笔、手机等
D.
话筒灵敏度分贝值始终>0
【单选题】Only by telling the truth win the trust and support of your friends.
A.
you can
B.
can you
C.
you did
D.
did you
【单选题】. Our teacher has a __________ for thinking up ways _________ his speeches attractive.
A.
gift, of making
B.
gift, to making
C.
knowledge, of making
D.
knowledge, to make
【单选题】If friends support you during a difficult time, they
A.
show their love and concern for you.
B.
do nothing to help you.
C.
ask you if you can get along without their help.
【单选题】What is the best title for this passage?
A.
Friends: More like a Burden than a Support.
B.
A Life without Friends is Meaningless.
C.
Friends: When Less is More.
D.
Cut Off the Unwanted Friends.
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