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【单选题】
复数z= 2-i 2+i 等于（ ）A.
3-4i 3
B.
5-4i 3
C.
3-4i 5
D.
5-4i 5
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【单选题】下列各式不成立的是（ ）
A.
20+（-9）-7+（-10）=20-9-7-10
B.
-1+3+（-2）-11=-1+3-2-11
C.
-3.1+（-4.9）+（-2.6）-4=-3.1-4.9-2.6-4
D.
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【简答题】Questions 16 to 18 are based on the passage you have just heard.
【简答题】Questions 16 to 18 are based on the passage you have just heard.
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