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【单选题】
已知函数 y= 1-x + x+3 的最大值为M，最小值为m，则 m M 的值为（ ）A.
1 4
B.
1 2
C.
2 2
D.
3 2
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A.
正确
B.
错误
【判断题】Listen to a short conversation, and then look at the statements below. Write a "T" in front of a true statement and an "F" in front of a false one according to the recording. The conversation will be ...
A.
正确
B.
错误
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