单项选择题

Since you are so weak, you should take every ______ precaution against catching cold.

A．critical
B．comparable
C．distinct
D．conceivable
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单项选择题
Their experiments show that the ______ strain of wheat grows more quickly and is resistant to disease.
A．newly planted
B．newly cultivated
C．hybrid
D．imported
单项选择题
Mr. Li is the present ______ of the presidential chair of the company.
A．transaction
B．prescription
C．professor
D．incumbent
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