The intellectually（） enterprise of science depends on free communication.

单项选择题It was clear that the storm （） his arrival by two hours.

A. retarded
B. retrieved
C. refrained
D. retreated

单项选择题The last sentence of the passage suggests that （）。

A. the consumer should be allowed to do things his own way
B. the consumer should be treated like a king
C. the consumer should have the final say in the selling of any product
D. the consumer should be advised on what to buy