单项选择题

A．An educational problem.
B．A health problem.
C．A Chemical problem.
D．An environmental problem.
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单项选择题
Candler was skillful at advertising and showed much imagination in understanding the potential.
A．Y
B．N
C．NG
单项选择题
According to the author, most students ____________.
A．believe the world’’s environment is in an undesirable condition
B．agree that the environment of the world is not as bad as it is thought to be
C．get high marks for their good knowledge of the world’’s environment
D．appear somewhat unconcerned about the state of the world’’s environment
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