单项选择题

The best title for the passage might be _________.

A．Life Possibility on Mars.
B．Creatures Frozen 320,000 years Still Alive.
C．Growth of Microorganisms.
D．New Scientific Discovery.
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单项选择题
_________ brings about happiness has utility, according to the doctrine of utilitarianism.
A．It
B．each
C．Whatever
D．Why
单项选择题
_________ , he always tries his best to complete it on time.
A．However the task is hard
B．However hard the task is
C．Though hard the task is
D．Though hard is the task
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