单项选择题

Experiments show that ______.

A．caffeine users can sleep longer than non-users
B．non-users usually fall asleep more easily than caffeine users
C．caffeine can help people to fall asleep
D．caffeine users wake up more early than non-users

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单项选择题

Generous public funding of basic science would ______ considerable benefits for the country's health, wealth and security.

A．lead to
B．result from
C．lie in
D．settle down

单项选择题

In a time of social reform, people's state of mind tends to keep ______ with the rapid changes of society.

A．step
B．progress
C．pace
D．touch