单项选择题

A．Because every species becomes extinct.
B．Because humans beings are powerful enough to kill other species.
C．Because of over-population.
D．Because human being is still a young species though it is exploiting the environment.
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单项选择题
A．Japanese students study much harder than Columbian students.B．Columbian students score higher than Japanese students in math.C．Columbian students are more optimistic about their math skills.D．Japanese students have better conditions for study.
A．Japanese students study much harder than Columbian students.
B．Columbian students score higher than Japanese students in math.
C．Columbian students are more optimistic about their math skills.
D．Japanese students have better conditions for study.
单项选择题
A．The man should start running daily.B．She also prefers to exercise in the afternoon.C．It’s important to warm up before exercising.D．The man should continue his exercise program.
A．The man should start running daily.
B．She also prefers to exercise in the afternoon.
C．It’s important to warm up before exercising.
D．The man should continue his exercise program.
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