单项选择题

A．He is conducting a survey.
B．He is doing a search.
C．He is trying to improve the Student Union.
D．He is asking for directions.
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单项选择题
By dividing students into small groups, teachers ______.
A．find it easier to handle tile in-class teaching
B．can participate in group work conveniently
C．help develop students' abilities in critical thinking
D．reinforce students' ability in cooperation and communication
单项选择题
Which of the following should play the leading role in the solution of environmental problems
A．Legislation and government intervention.
B．The industry's understanding and support.
C．The efforts of environmental health professionals.
D．The cooperation of ecologists, environmental activists and conservationists.
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