单项选择题


Questions 19—22

A． Five years.
B． Fi{teen years.
C． Fifty years.
D． A hundred years.
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单项选择题
A． The increase of human population.B． The extinction of dinosaurs.C． The cutting down of forests.D． The great demand for animal parts.
A． The increase of human population.
B． The extinction of dinosaurs.
C． The cutting down of forests.
D． The great demand for animal parts.
单项选择题
A． Try another approach.B． Give yourself some time for sleeping.C． Keep on learning and practicing.D． Reward yourself from time to time.
A． Try another approach.
B． Give yourself some time for sleeping.
C． Keep on learning and practicing.
D． Reward yourself from time to time.
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