What can we infer from the passage
A. Dogs have a natural instinct to return home.
B. Seeing-dogs sometimes may not obey its master.
C. Dogs are kept mostly as companions for old people.
D. Guarding dogs always nm fast.
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The old man repented that he ______idle when young.
A. has been
B. having been
C. had been
D. have been
对同一种药物来讲，下列说法错误的是
A. 不同个体，药物用量相同，但作用不一定相同
B. 女性患者表现出来的效应可能与男性不同
C. 老年人的用药量应比成人的用药量大
D. 孕妇应用表现出来的效应可能与非孕妇女不同
E. 小儿用药剂量的大小与体重有关
Our scientific findings cannot be regarded as ______. in such a short period of time.
A. to have been obtained
B. to be obtained
C. having been obtained
D. being obtained
APC片的正常外观是
A. 黄绿色片，味微酸
B. 红色带荧光片
C. 橙黄色片
D. 白色片，味微酸
E. 绿色，味咸
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