单项选择题

A．Their tasty meat.
B．The principle of their defense system against disease.
C．Their solid skin.
D．The principle of their birth modes.
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单项选择题
The Arctic is warming faster than the rest of the world.
A．Y
B．N
C．NG
单项选择题
A．He had better stop taking the cough medicine.B．He will take another medicine instead of this.C．He should have patience to cure his cough.D．He should take the medicine for a long time.
A．He had better stop taking the cough medicine.
B．He will take another medicine instead of this.
C．He should have patience to cure his cough.
D．He should take the medicine for a long time.
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