单项选择题

What is the main subject of this passage

A．Mr. Mamedov's life.
B．A description of several societies where people live a long time.
C．Suggestions for how you can live a long life.
D．Hard physical work is a good way to live a long time.

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单项选择题

The passage implies that ______.

A．the fever process is widespread because moderate fevers have benefits
B．the reduction of fevers can inhibit bacterial growth
C．man can use sun lamp to raise lizards' temperature
D．crayfish injected with bacteria have a purpose for moving to hot areas

单项选择题

Which of the following best states the main idea of the passage

A．Cold-blooded animals can develop fevers.
B．There are benefits to developing fevers.
C．Fevers inhibit bacterial growth.
D．Lizards can develop fevers.