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【单选题】
函数 的图象与x轴所围成的封闭图形的面积（ ）A.
3
B.
C.
D.
4
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反馈参考答案：
举一反三
【简答题】A．unlimited B．specific C．definite D．finite
【单选题】Which of the statement is true about estimating with finite sums?
A.
Finite sums have finite many terms.
B.
The finite sum method is a precise estimation.
C.
The circumference of a circle is smaller than the sum of bottoms of the triangles from an inscribed polygon.
D.
Every term in a finite sum is positive.
【判断题】Language is a set finite or infinite of sentences, each finite in length and constructed out of a finite set of elements.
A.
正确
B.
错误
【单选题】判断划线部分动词是限定动词(finite )还是非限定动词(non-finite) 1. Paul runs to work every day
A.
Finite
B.
Nonfinite
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