问题
选择题
（2011•桂林）若点P（a，a﹣2）在第四象限，则a的取值范围是（ ）
A．﹣2＜a＜0
B．0＜a＜2
C．a＞2
D．a＜0
答案
B．
根据第四象限点的坐标符号，得出a＞0，a﹣2＜0，即可得出0＜a＜2，选出答案即可．
解：∵点P（a，a﹣2）在第四象限，
∴a＞0，a﹣2＜0，
0＜a＜2．
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（2011•桂林）若点P（a，a﹣2）在第四象限，则a的取值范围是（ ）
A．﹣2＜a＜0
B．0＜a＜2
C．a＞2
D．a＜0
B．
根据第四象限点的坐标符号，得出a＞0，a﹣2＜0，即可得出0＜a＜2，选出答案即可．
解：∵点P（a，a﹣2）在第四象限，
∴a＞0，a﹣2＜0，
0＜a＜2．
There are times in our lives when we remember. Remembering the good things of __46__ is a most precious (宝贵的) time; these memories are __47__ in the corner of my mind. When I was four years old, I often went to a kindergarten (幼儿园). I __48__ many toys and friends that made me laugh and cry. The teachers were __49__ and friendly. They taught us many interesting songs and games. We played all day long. We did not know what learning was at that time, __50__ we were learning every day. When I was __51__ years old, I started school. I was very __52__ because I became a school student and began to learn school subjects. My favourite subject was __53__. I remember, the first day, our science teacher told us the sun was like a big fire ball and __54__ was very, very far away. Nobody could stay close to that "ball". We were quite surprised and kept our mouths open. We began to wonder at the __55__ of the universe(宇宙). Later on, more ideas __56__ weather, planes, railways, wildlife, deserts and even pollution came to our ears. We began to learn __57__. When I was about ten years old, I __58__ quite a lot of things. I began to read newspapers, keep a diary, visit museums __59__ make many friends. Every day was something new. Every day was interesting and exciting. Now I am in the middle school. Each day is new to me. Happily I am still learning, which is like a journey to me. I have finished the first part, but there is still a long __60__ for me to go. I hope I will become a learned person someday.
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