单项选择题

The author' s purpose in writing this article is to ______.

A．tell the readers the power and influence of an effective essay
B．persuade the readers to do something to protect the environment
C．encourage the readers to challenge the authorities by writing essays
D．teach the readers to put what they learned in the class into practice
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单项选择题
Which of the following statements is true according to the passage
A．The majority of the students in the two schools found it acceptable to pay a bit more to eat their lunch from paper trays.
B．Scientific evidence indicates that polystyrene can seriously break down the protective ozone layer of the atmosphere.
C．The Board of Education changed its decision immediately after Vogt and her classmates presented their findings to it.
D．The Board of Education at last voted and decided to change to paper trays in these two schools from February 1, 1989.
单项选择题
Which of the following statements is true according to the passage
A．Hispanics are the largest ethnic group in the United States.
B．All Hispanics in the US are thought to be legal immigrants.
C．Though slowing in population growth, African-Americans will still become the second largest minority in the US.
D．The white, non-Hispanic majority in the United States of America will always decrease in numbers twenty years from now.
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