治疗强心苷中毒引起的窦性心动过缓宜选用()。
A.阿托品
B.肾上腺素
C.苯妥英钠
D.利多卡因
参考答案:A
The young doctor is determined to devote all his life to ________ the cause of cancer.
A.studying
B.studied
C.study
D.studies
进化生物学研究的内容是什么?