题目内容

Sally is _____ some pictures on the wall.

A. look
B. look at
C. looking at

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The student isn't ______.

A. doing his homework
B. do his homework
C. does his homework

These cooks are _______ in the kichen.

A. cook a meal
B. cooking a meal
C. cook

The aeroplane is ______ the river.

A. flying on
B. flying
C. flying over

归一化法的优点不包括( )。

A. 简便、准确、不需要标准物
B. 不必准确称量
C. 操作条件稍有变化对结果影响较小
D. 不需要校正因子