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【单选题】
对l7一羟类固醇检查的尿标本使用浓盐酸防腐剂的作用是A.
防止尿中激素被氧化
B.
固定尿中有机成分
C.
保持尿液的化学成分不变
D.
避免尿液被污染变质
E.
防止尿液颜色改变
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【单选题】听力原文：M: Hello. Matt Ellis speaking. W: Hello, Dr. Ellis, my name's Mary Johnson. My roommate, Janet Holms, wanted me to call you. M: Janet Holms? Oh, that' s right she' s in my class. Has anything hap...
A.
She refused to submit her essay.
B.
She sent a job application.
C.
She had an interview.
D.
She had an accident.
【单选题】If she says such things, she is not a friend of ______.
A.
my mother's
B.
my mothers'
C.
my mothers
D.
my mother
【单选题】________ is my aunt, and ________ is my uncle. [ ]
A.
It; it
B.
She; he
C.
He; she
D.
she; it
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