不定项选择

8.植物磷素营养的临界期一般出现的幼苗期。

A．错误
B．正确

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多项选择题

关于银镜反应，以下操作正确的是 ( ) A.
试管清洁干净 B.
托伦试剂须现配现用，不可久置 C.
实验完毕后，用浓硝酸溶解反应生成的银镜，洗净试管 D.
使用热水浴加热，不断振荡试管

单项选择题

Read the paragraph and choose the right answer to the following question.
“My metaphor will remind some of you of the famous picture in which Retzsch has depicted Satan playing at chess with man for his soul. Substitute for the mocking fiend in that picture a calm, strong angel who is playing for love, as we say, and would rather lose than win--and I should accept it as an image of human life.”
How does the writer understand human life?
A、Human life is a chess game between Satan and men.
B、Human life is a game and if we lose we lose our soul.
C、Human life is a game that men play with a merciful angel.
D、Human life is a game which we would rather lose than win.