The sentence "They were wanted to remain quiet and not to expose themselves." is a ______
A. simple
B. coordinate
C. compound
D. complex
长春新碱具有
A. 降压作用
B. 抗肿瘤作用
C. 抗菌作用
D. 镇痛作用
E. 平喘作用
托品烷分子中含有环氧基，对中枢具有较强作用的药物是
A. 氢溴酸后马托品
B. 硫酸阿托品
C. 氢溴酸东莨菪碱
D. 氢溴酸山莨菪碱
E. 丁溴东茛菪碱
______ is the first American writer who is granted Nobel Prize of Literature.
A. Sinclair Lewis
B. John Steinbeck
C. William Faulkner
D. O. Henry
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