单项选择题

What does "gilt-edged diploma" mean in the second paragraph

A．Diploma of an elite college.
B．Diploma of an expensive college.
C．Diploma of a private college.
D．Diploma of a public college.
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单项选择题
Which one of the following is not mentioned as a reason to criticize Kmeger and Dale's research
A．Only a small number of colleges are involved in their survey.
B．Only a small range of universities are surveyed in their research.
C．They have adopted a method that is too strict and critical.
D．They have drawn conclusions that are not very convincing.
单项选择题
According to the passage, what kind of environmental problem will sandstorms bring about
A．It will turn cities dirtier than they used to be.
B．It wilt make people hard to breathe clean air.
C．It will prevent people finding their direction.
D．It will cause serious air pollution in people's life.
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