单项选择题

What does SMS stand for

A．Short message service.
B．Sound modulation system.
C．Advanced information service.
D．Special mobile system.
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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
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
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