0311测试
Interactive Video
•
Science
•
3rd Grade
•
Easy
Chaonan Ping
Used 1+ times
FREE Resource
2 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
问题1：热气球上升的原理是什么？
A. 热气球内部的空气被冷却
B. 热气球内部的空气被加热
C. 热气球内部的空气被压缩
D. 热气球内部的空气被抽空
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
问题2：在制作热气球的过程中，为什么需要用火加热气球内部的空气？
A. 为了使气球变得更重
B. 为了使气球内部的空气密度变小
C. 为了使气球外部的空气变热
D. 为了使气球变得更小
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