单项选择题

According to the passage, up to now, anti-drag education ______

A．has made all people see the danger of drugs
B．has succeeded in dissuading people from using drugs
C．has been effective only to a certain degree
D．has proved to be a total failure

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单项选择题

The underlined word heed in the last but one sentence of the passage means ______

A．lawsuit
B．interest
C．attention
D．expense

单项选择题

What is the topic of the article

A．What can nature contribute to technology
B．Environment can sometimes block the progress of technology.
C．Technologies of all kinds should serve the natural environment.
D．Environment deserves the most attention in the development of technologies.