单项选择题

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

A．He has edited three books.
B．He has bought the wrong book.
C．He has lost half of his money.
D．He has found the book that will be used.
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单项选择题
It can be inferred from paragraph 2 that children who gel sufficient food might suffer malnutrition because ______.
A．they eat too much rubbish food everyday
B．they take little physical exercise
C．they are lacking in some kinds of necessary nutrients
D．their mothers do not have time to take care of them in the day
单项选择题
According to the passage, black holes ______.
A．include protons
B．oppose the quantum theory
C．stop anything from escaping
D．give off radiation
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