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【单选题】
科学家做了如下探究实验： ①将20只生理状况相同的糖尿病大鼠随机均分成甲、。 ②甲组大鼠每天喂2毫升桑叶提取液，乙组大鼠每天喂等量蒸馏水，期间各组大鼠均喂相同的食物， ③30天后，甲组大鼠血糖浓度明显下降，乙组大鼠血糖浓度没有明显变化。 下列关于此实验的说法，错误的是（ ）A.
此实验的目的是探究桑叶提取液能否治疗糖尿病
B.
乙组大鼠所起的作用是作为对照
C.
桑叶提取液的作用类似于甲状腺激素
D.
每组用10只大鼠而不是1只，目的是减少实验的偶然性
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举一反三
【单选题】Because of the patient’s health, ____________ .
A.
losing weight was advised him by doctor
B.
he was advised by the doctor to lose weight
C.
the doctor’s advise was him losing weight
D.
lose weight was what the doctor advised
【单选题】The patient’s health failed to such an extent that he was put into _____ care.
A.
intensive
B.
rigid
C.
tense
D.
tight
【单选题】The patient’s health failed to such an extent that he was put into ____ care.
A.
tense
B.
intensive
C.
rigid
D.
tight
【单选题】The patient’s health failed to such an extent that he was put in ______ care.
A.
tense
B.
tight
C.
loose
D.
intensive
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