若m、n是正整数,且2m·2n=25,则m、n的值有 [ ]
A.4对
B.3对
C.2对
D.1对
答案:A
若m、n是正整数,且2m·2n=25,则m、n的值有 [ ]
A.4对
B.3对
C.2对
D.1对
答案:A
The sun is shining and it’s very hot. many people don’t want to go out after . Mrs West has to(不得不) meet her father at the airport. Her father doesn’t feel well, he wants to see a in the city hospital. Now she’s in the street. There no trees and she feels very . But she’s too and can’t walk fast(快). Suddenly she finds(发现) a walking behind her. She gets angry and her face turns red. “Why are you walking me, boy?” She asks strictly. “It’s cooler”. The boy answers.
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