【单选题】【消耗次数：1】
能引起四环素牙的药物有
①
先锋霉素和四环素
②
土霉素和去甲金霉素
③
青霉素和缩水四环素
④
链霉素和氯霉素
⑤
洁霉素和庆大霉素
参考答案：
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相关题目
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四环素用于（ ）
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使用四环素治疗无效的是（ ）
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对四环素的抗菌作用机制是
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影响胞浆膜的通透性
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与核糖体30s亚基结合，抑制蛋白质的合成
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与核糖体50s亚基结合，抑制移位酶的活性
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与核糖体50s亚基结合，抑制肽酰基转移酶的活性
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特异性抑制依赖于DNA的RNA多聚酶活性
随机题目
【单选题】
I’m very sorry to have ____ you with so many questions on such an occasion.
①
interfered
②
offended
③
impressed
④
bothered
【单选题】
If we say some food is ____, we mean it is safe to eat.
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ideal
②
editable
③
ideate
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edible
【单选题】
Most people came to realize that it was about time the government ____ further measures to control the population.
①
must take
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is taking
③
takes
④
took
【单选题】
He always has a lot of _______ ideas in his mind , and sometimes we do not even know what he is thinking about.
①
novel
②
spoil
③
acceptable
④
additional
【单选题】
Her skin was dry after ____ to the wind during the trip.
①
failure
②
disclosure
③
exposure
④
pressure
【单选题】
Though ____ in a big city, Peter always prefers to paint the primitive scenes of country life.
①
grown
②
raised
③
tended
④
cultivated
【单选题】
The medicine is on sale everywhere. You can get it at ______ chemist’s.
①
each
②
some
③
certain
④
any
【单选题】
The computer has brought about surprising technological changes ____ we organize and produce information.
①
in a way
②
in the way
③
in that way
④
in no way
【单选题】
When Mr. Jones gets old, he will ____ his business to his son.
①
take over
②
hand over
③
think over
④
get over
【单选题】
The ____ of Liberty was dedicated on an island in Upper New York Bay in 1886.
①
Status
②
Statue
③
Stature
④
State