问题
选择题
下列用科学记数法表示各数的算式中，正确的算式有： ①5489=5.489×10﹣3；②﹣21400=﹣2.14×104 ③0.000000543=5.43×10﹣7；④﹣0.0000123=1.23×10﹣5 [ ]
A．①和②
B．①和③
C．②和③
D．②③④
答案
答案：C
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下列用科学记数法表示各数的算式中，正确的算式有： ①5489=5.489×10﹣3；②﹣21400=﹣2.14×104 ③0.000000543=5.43×10﹣7；④﹣0.0000123=1.23×10﹣5 [ ]
A．①和②
B．①和③
C．②和③
D．②③④
答案：C
Look at this picture. This is a photo 1 my family. There are 2 people in the picture. They are my 3 , my mother, my brother, my sister and me. My father 4 very happy every day. My mother is near my father. The __5 beside (在……旁边) my mother is my brother. He 6 play sports. The little girl near my mother is my 7 . 8 is very smart and cute. Everyone likes 9 very much. Who is 10 boy in the middle (在中间)? Ah! It is me. I love my family very much.
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