单项选择题

A．Only humans respond to emotions by shedding tears.
B．Only humans shed tears to get rid of irritating stuff in their eyes.
C．Only human tears can resist the invading bacteria.
D．Only human tears can discharge certain chemicals.
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单项选择题
A．She has always believed they exist.B．She heard about them in New Zealand.C．Stories about them may be based on giant squid.D．The instructor mentioned them in the lecture.
A．She has always believed they exist.
B．She heard about them in New Zealand.
C．Stories about them may be based on giant squid.
D．The instructor mentioned them in the lecture.
单项选择题
South of the lake country is a broad though shallow valley.
A．Y
B．N
C．NG
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