单项选择题

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

A．The result is what she had expected.
B．The test is not well designed.
C．Too few students got high marks.
D．Differences between students’ grades are big.
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单项选择题
The oxidation of the decayed dead algal bodies can’t ______ .
A．lower the amount of oxygen in the fiver water
B．make the water taste badly
C．make the water unsuitable for human consumption
D．make the bacteria dead
单项选择题
What is the passage mainly about
A．Science teachers banning testing harmful to animals.
B．Teachers’ policy change in experiment on animals.
C．The new policies of banning harmful experiments to animals.
D．The importance of prohibiting harmful experiments on animals.
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