单项选择题
A．increases the ability to think B．is the best time for thinking C．is better for thinking than is very warm weather D．decreases the ability to think
A．a great effect on everyone's intelligence B．same effect on most persons' intelligence C．some effect on a few persons' intelligence D．no effect on most persons' intelligence
A．It was Tom who suggested that I open the bottle. B．I opened it easily without any help. C．I put it between my knees and began to pull. D．The guests gave me many helpful suggestions.