单项选择题

The rats fed unrestricted diets do NOT

A．have one preventing-aging protein increased.
B．have their cell death increased or doubled.
C．have their DNA fragmentation doubled.
D．have the levels of proteins increased.

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单项选择题

There are fast buses, double-decker buses, air-conditioned or heated buses ______ a good service.

A．all to offer
B．all are offering
C．all offering
D．all offered

单项选择题

______ may be said against the popular newspapers, it can hardly be argued that they are catering to readers' daydreams.

A．Whatever
B．Whichever
C．However
D．Whoever