2. 外语
  3. A、A kind of motion. B、A steady speed. C、The motion of a plane. D、An increase in speed. D注意听懂问题“What is the acceleration?(什么是加速?)

A、A kind of motion. B、A steady speed. C、The motion of a plane. D、An increase in speed. D注意听懂问题“What is the acceleration?(什么是加速?)

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问题  
What is the acceleration?
选项 A、A kind of motion.
B、A steady speed.
C、The motion of a plane.
D、An increase in speed.
答案D
解析 注意听懂问题“What is the acceleration?(什么是加速?)”结合听懂的“We can feel acceleration, an increase in speed.”得出D项正确。
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