题目内容：
Retention refers to__________
参考答案：
答案解析：
单选题：Retention refers to__________
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The development of the university relies to a certain extent
The development of the university relies to a certain extent on__________A．both
The amount of water your body needs per day is closely relat
The amount of water your body needs per day is closely related__________
Those who net the flu vaccine are surely protected from the
Those who net the flu vaccine are surely protected from the diseaseA．Right B．Wro
The control group patients regretted not having had stem cel
The control group patients regretted not having had stem cell injections-A．Right
She has been the subject of massive media coverage．
She has been the subject of massive media coverage．A．extensive B．negative C．resp