问题
单项选择题
原子荧光法测量的是（）。
A．溶液中分子受激发产生的荧光
B．蒸气中分子受激发产生的荧光
C．溶液中原子受激发产生的荧光
D．蒸气中原子受激发产生的荧光
答案
参考答案：D
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原子荧光法测量的是（）。
A．溶液中分子受激发产生的荧光
B．蒸气中分子受激发产生的荧光
C．溶液中原子受激发产生的荧光
D．蒸气中原子受激发产生的荧光
参考答案：D
Several years ago, we moved into the apartment where we live now. When my friends helped me move in, the downstairs neighbors began to 36 about the noise. I could do 37 about it. After all, noises are unavoidable(不可避免的).How can anyone move in 38 . Still 39 ,the complaints continued on a daily basis—well after the first day. We walked “too loudly”down the stairs, we laughed too often, we opened and closed the door too many times…They had many 40 to complain. Nobody can stand the endless complaints and quarrels. I soon learned that they had 41 the last few families who lived above them by the same way. So I had the information I needed and I tried to 42 every situation carefully. I tried to walk in 43 to avoid any possible noises. Whenever they called 44 came to the door with a complaint, no matter how unreasonable, I simply listened. From their confused expressions, I could imagine that they had never expected to get a 45 attitude from me. Of course, it was hard to keep calm but my sister and I 46 . I told my sister that we were going to be pleasant and 47 them to change their attitude to neighbors. I explained to her that they probably felt 48 in their lives because they are common people. 49 , they were always looking for a 50 to show their power so that nobody could look down upon them. I continued smiling and greeting them as I saw them, much to their 51 .On more than one occasion(不止一次), I ended up 52 them. They thanked me before they left. Unexpectedly, the next time I saw them, they all smiled and 53 friendly. We had a short but pleasant 54 . Ever since then, they’ve been very pleasant neighbors, and we’ve become good 55 .
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