单项选择题

The main idea of the passage is about______.

A．global marine distribution
B．secrets of the world's oceans
C．research on marine life
D．satellite tracking devices
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单项选择题
Medical scientists believe that______.
A．tests have been designed to settle the cholesterol dispute
B．drugs have been tested to reduce the amount of the substance in blood
C．low cholesterol foods or anti-cholesterol drugs or both can reduce the chance of a heart attack
D．none of the statements mentioned above is correct
单项选择题
Some scientists believe that there is no evidence that cholestrol in food is directly linked to_____.
A．blood disease
B．heart disease
C．infectious disease
D．mental disorder
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