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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单项选择题

Wben the error is small, the statistical principles used in dealing with it are （） when the error is big.

A．simpler than
B．more difficult than
C．not yet understood
D．the same as

单项选择题

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

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