单项选择题

Questionsll-14 are based on the following passage. What is the best title for the passage

A．Dream Period.
B．Active Sleep.
C．Passive Sleep.
D．Sleep Cycle.
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单项选择题
Why do dolphins attach each other head-to-head
A．They are making fun of each other.
B．They are doing exercise.
C．They are trying to damage the hearing system of their opponents.
D．They are gang raping.
单项选择题
What does Betty say about making friends in a new place
A．It is easy because the people are friendly.
B．It is difficult because the people are not friendly.
C．It is difficult in spite of friendly people.
D．It is easy even when the people are not friendly.
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