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【单选题】
关于酶的必需基团的下列叙述，错误的是A.
可与底物结合
B.
可由辅助因子提供
C.
可维持酶活性中心的结构
D.
只存在于酶的活性中心内
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举一反三
【单选题】When adolescents feel disillusion with their parents, it means that they
A.
feel disappointed with their parents.
B.
are developing into maturity.
C.
just want to hurt their parents.
D.
are expressing their discontentment.
【简答题】As children enter adolescents, they begin to do the following except ______.
【单选题】The new study published in Pediatrics shows that
A.
thousands of children and adolescents in the US are bullied yearly.
B.
the outcome of being bullied by siblings is worse than that by peers.
C.
kids bullied by their siblings are more depressed than those who not.
D.
being bullied by siblings is exactly the same as being bullied by others.
【单选题】听力原文： Honduran authorities dedicated to the protection of children and adolescents have undertaken a campaign to protect youngsters who beg on the streets. In the capital of Tegucigalpa alone, the eff...
A.
the police.
B.
the district attorney.
C.
the prison authorities.
D.
Institute of Childhood and Family.
【单选题】What is mentioned by the passage as a way for the adolescents to attract attention to themselves?
A.
To commit serious crimes.
B.
To work hard.
C.
To get ill and go to hospital.
D.
To engage in competition.
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