Why did Iain Duncan Smith call for an official endorsement of marriage?
A.It would improve family stability and facilitate the upbringing of children as well as people's future development.
B.Low birth rate has threatened the population of the country.
C.British government did little in the marital affairs of people.
D.Various measures should be adopted by the government to encourage marriages.
第5题
药物的半数致死量(LD50)是指:
A.抗寄生虫药杀死一半寄生虫的剂量
B.致死半数动物的剂量
C.抗生素杀死一半细菌的剂量
D.产生严重副反应的剂量
E.致死量的一半
第6题
药物的半数致死量(LD50)是指:
A 抗生素杀死一半病原菌的剂量
B 抗寄生虫药杀死一半寄生虫的剂量
C 引起半数实验动物严重毒性反应的剂量
D 引起半数实验动物死亡的剂量
E 致死量的一半
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