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
The main measures recently taken by the government to tackle the housing problem are ______.
A. setting limits to public spending
B. restricting house purchasing.
C. extensive construction projects
D. housing subsidies and easy bank loans
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