问题
选择题
点M在数轴上距原点4个单位长度，若将M向右移动2个单位长度至N点，点N表示的数是（ ）
A．6
B．-2
C．-6
D．6或-2
答案
因为点M在数轴上距原点4个单位长度，点M的坐标为±4．
（1）点M坐标为4时，N点坐标为4+2=6；
（2）点M坐标为-4时，N点坐标为-4+2=-2．
所以点N表示的数是6或-2．
故选D．
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点M在数轴上距原点4个单位长度，若将M向右移动2个单位长度至N点，点N表示的数是（ ）
A．6
B．-2
C．-6
D．6或-2
因为点M在数轴上距原点4个单位长度，点M的坐标为±4．
（1）点M坐标为4时，N点坐标为4+2=6；
（2）点M坐标为-4时，N点坐标为-4+2=-2．
所以点N表示的数是6或-2．
故选D．
| 补全对话：选择方框内适当的选项填入短文空白处(有一项是多余的)。 | |
| A: What are you doing? B: 1 A: Great! Can you tell me something about the book? B: Certainly! It sa  ys 1,000 years ago, the world's population was very small. 2  A: Really? B: Yes, but during the last three or four hundred years, the world's population has grown very quickly. Today, it is growing faster than ever before. 3 A: Sorry, I don't know. B: It's more than 6 billion. A: It's so big. 4 B: Yes. If we don't control the population, there will not be enough space even to stand in on the earth in 600 years. A: 5
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