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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What does the author think about culture shock
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.
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