What can we infer from the last paragraph of the article
A. The severely fat patients are threatened with potential illness.
B. The diet-pills have been sold to all comers without discrimination.
C. The diet-pills should not have been hailed as miraculous cures and then discarded as dangerous drugs.
D. The diet-pills were intended to a short-term cure for the very fat.
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样本相关系数的假设检验，其备择假设为
A. ρ＝0
B. r≠0
C. ρ≠0
D. 两变量相关关系密切
E. 两变量有直线相关关系
The underlined phrase in the first paragraph "pill poppers" most probably refers to ______.
A. pill inventors
B. pill takers and abusers
C. pill manufacturers
D. pill distributors
屠格涅夫的成名作是
A. 《罗亭》
B. 《猎人笔记》
C. 《木木》
D. 《阿霞》
下列关于反射的叙述，错误的是
A. 是在中枢神经参与下机体对刺激发生的规律性反应
B. 其结构基础是反射弧
C. 反射弧包括感受器、传入神经、中枢、传出神经和效应器五部分
D. 只要中枢存在，刺激即可引起反射
E. 包括非条件反射和条件反射
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