单项选择题

The passage is mainly about ______.

A．the high incidence of heart disease in some countries
B．the effect of fish eating on people's health
C．the changes in people's diet
D．the daily fish consumption of people in different cultures

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单项选择题

According to the passage, an assertive person ______.

A．makes other people feel unfairly treated
B．puts forward his ideas at the expense of others
C．does not show respect to other people
D．speaks out what he wants to say forcefully

单项选择题

Which of the following is NOT true according to the passage

A．The Dutch research has proved that eating fish can help to prevent heart disease.
B．Heart doctors won't call your house so long as you keep eating fish each day.
C．Among all the diseases heart disease is the most dangerous in America.
D．There is a low incidence of heart disease in such countries as Japan and Greenland.