单项选择题

According to the writer, the exactness of a science is partly related to （）

A．the skill of the scientist
B．the extent to which variables can be controlled
C．the requirements of the observer
D．the development of more accurate instruments

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热门试题

单项选择题

How often is physical science more accurate than biological science（）

A．Never.
B．Always.
C．Usually.
D．Occasionally.

单项选择题

How did he find Ireland（）

A．He happened to fly over it.
B．He remembered it himself.
C．He made a guess and happened to be right.
D．He figured it out with the help of some simple instruments.