单项选择题

The author suggests that Americans suffer from hypertension as a result of______.

A．too much salt
B．salt-free cuisine
C．emotional stress
D．ailments
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单项选择题
What do people most probably believe in about a process
A．Its definition.
B．Its explanation.
C．Its examples.
D．Its main idea.
单项选择题
Which statement is FALSE
A．Members of a species differ from one another.
B．differences between individuals are inherited.
C．Two organisms with identical genes may grow to different sizes.
D．More organisms are born than live to reproduce.
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