问题
单项选择题
计算
的值是（）。
A．A
B．B
C．C
D．D
答案
参考答案：D
解析：
本题在表达式前乘以一个(1-1/2)，除以一个(1-1/2)之后，可以利用公式计算得到结果为
故选D。
搜题请搜索小程序“爱下问搜题”
计算的值是（）。
A．A
B．B
C．C
D．D
参考答案：D
解析：
本题在表达式前乘以一个(1-1/2)，除以一个(1-1/2)之后，可以利用公式计算得到结果为故选D。
I used to live selfishly, I should admit. But one moment changed me. I was on my lunch break and had ___ the office to get something to eat. On the way，I __a busker(街头艺人)，with a hat in front of him. I had some ___ in my pocket，but I would not give them to him, thinking to myself he would __ use the money to feed his addiction to drugs or alcohol. He___ like that type— young and ragged. ___ what was I going to spend the money on? Only to feed my addiction to Coca-Cola or chocolate! I then ___ I had no right to place myself above ___ just because he was busking. I ___ and dropped all the coins into his __，and he smiled at me. I watched for a while. As ___ as it sounds，I expected something more to come from that moment—a feeling of ___ or satisfaction, for example. But nothing happened. ___ ,I walked off. “It proved to be a waste of __ .”I thought. On my way home at the end of the ___ , I saw the busker again and he was __ .I watched him pick up the hat and walk __ a cafe counter. There he poured the ___ contents into a tin collecting __ an earthquake fundraising(募捐) event. He was busking for charity! Now I donate any ___ I have to charity tins and enjoy the feeling of giving.
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