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【单选题】
等成本曲线向外平行移表明（ ）。A.
产量提高了
B.
成本增加了
C.
生产要素价格按相同比例上升
D.
无法确定
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反馈参考答案：
举一反三
【简答题】求下列函数的定义域： （1）f（x）= ； （2）f（x）= 。
【单选题】—_______ next year? —She is going to learn more about English. [ ]
A.
When is she going to learn more about English
B.
What does she do
C.
What's she going to do
D.
Where is she going to do
【单选题】Which of the following statements is TRUE?
A.
The more we read and learn, the more ignorant we are.
B.
The more we read and learn, the more learned we are.
C.
The more we read and learn, the more confused we will be.
D.
The more we read and learn, the more snobbish we become.
【单选题】More and more people will have fun _____ English. [ ]
A.
learn
B.
learns
C.
to learn
D.
learning
【简答题】求下列函数的定义域： （1）f（x）= ； （2）f（x）= +4。
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