问题
选择题
已知点A（a，-2）与点B（-1，b）关于x轴对称，则a+b=（ ）
A．-3
B．3
C．-1
D．1
答案
∵点A（a，-2）与点B（-1，b）关于X轴对称，
∴a=-1，b=2，∴a+b=1，故选D．
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已知点A（a，-2）与点B（-1，b）关于x轴对称，则a+b=（ ）
A．-3
B．3
C．-1
D．1
∵点A（a，-2）与点B（-1，b）关于X轴对称，
∴a=-1，b=2，∴a+b=1，故选D．
| 根据对话内容从方框内所给的选项中选出最佳答案，使对话完整。注意：有多余选项。 | |
| Boy: Who do you admire (崇拜)? Girl: 1 Boy: Midori? Who's that? Girl: 2 Boy: Oh, yeah! She's Japanese, isn't she? Girl: Yes, she was born in Osaka in 1971. 3 When she was fourteen, she toured the United States. I saw her play when I was eight. Boy: Wow. 4 Girl: Yes, I do. I play them all the time. How about you? Who do you admire? Boy: I admire my grandmother, Laura. Girl: 5 Boy: Well, she was born in Russia in 1932. She was an unusual girl because she started ice skating when she was four, and she became a skating champion when she was ten. | |
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