单选题：More has been learned since.1945 about the chemical changes

题目内容：

More has been learned since.1945 about the chemical changes in the body than in all human history before ________ time. A．in
B．that
C．which
D．the

参考答案：

答案解析：

The writer explains the boiling water by using________.

The writer explains the boiling water by using________.A．myths B．humor C．facts

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A crater lake is at the tip of a________.A．mountain B．ridge C．island D．volcano

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We can conclude from this passage that camels________.A．feel at home in the des

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程控数字交换系统中，远端用户模块属于（　　）。A．外围设备 B．控制系统 C．话路系统 D．综合系统

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Do you think it necessary ________ an English diary every day?A．keep B．to keep

分类：英语题型：单选题