判断( )在空间中一个角的两边与另一个角的两边分别平行,则这两个角相等.
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判断( )在空间中一个角的两边与另一个角的两边分别平行,则这两个角相等或互补.
A. 对
B. 错
Where does Mark work now?
A. He works in a car factory.
B. He works in a car
C. He works in a factory that makes semi-trailers.
How long does it take to build a semi-trailer in Mark's new factory?
A. It takes between one to two months
B. It takes eight weeks.
C. It takes eight months.
Why did the cost of a Model T car drop after the introduction of the assembly line?
A. The products were more efficient.
B. The production was more efficient.
C. The assembly line was cheaper.
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