单项选择题

催产素可治疗的动物产科疾病是( )。 A．产后缺钙 B．胎衣不下 C．产后瘫痪 D．隐性乳腺炎 E．雄性动物不育

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多项选择题

‏边缘内生长的物种既包括斑块（）的物种也包括（）斑块的物种

A．内部
B．较远
C．差异
D．临近

单项选择题

Mark the letter that identifies the tone for each of the following sentences. Baseball was invented as an urban game in order for owners to make money, players to become arrogant, and spectators to drink overpriced beer.
A、objective
B、nostalgic
C、humorous