单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．She should follow the human nature.
B．Strangers are nothing to be afraid of.
C．Feeling nervous is nothing improper.
D．She should accept strangers’ presents naturally.
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单项选择题
What do we learn about the untreated industrial chemical wastes from the passage
A．They can conserve the normal biological action of rivers.
B．They all react with water to increase the acidity of rivers.
C．They make the water corrosive enough to destroy living organisms.
D．There are no rules for concentrations of unquestionably toxic chemicals of drinking water.
单项选择题
According to the text, animal welfare groups have succeeded in ______ .
A．stopping all animal abuse in schools
B．establishing guidelines that ban classroom experiments harming animals
C．protecting animals from being experimented with in extracurricular projects
D．persuading two national science teachers’ associations to adopt an animal protection policy
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