单项选择题

What is said about the communicative functions of laughter

A．Meanings conveyed by laughter vary with languages.
B．Laughter serves as a way of interaction with animals.
C．Laughter helped interaction before humans could speak.
D．Human laughed at the very beginning as a sign of pleasure.
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单项选择题
Why is laughter generally believed to be the best medicine
A．Because it keeps people away from falling ill.
B．Because it is an effective way to cure patients.
C．Because it increases the content of oxygen in blood.
D．Because it helps patients recover more quickly.
单项选择题
What can be inferred about the author's view on this major increase
A．He cannot decide if it will be effective to prevent illegal immigrations.
B．He believes that the number of Guard troops is larger than necessary.
C．He thinks there is still hope for the House to approve the proposal.
D．lie respects its aim but doubts its feasibility.
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