题目内容

Why does breathing become difficult for humans during a tornado

A. The wind becomes fast and hot.
B. Air pressure gets steadily lower.
C. The black area moves closer.
D. They are knocked to the ground.

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Why does breathing become difficult for humans during a tornado

A. The wind becomes fast and hot. B. Air pressure gets steadily lower. C. The black area moves closer. D. They are knocked to the ground.

Protestors demonstrated in the capital to show their dissatisfaction with__________.

The main structure of a nuclear family consists of

信号f(6-3t)表示( )。

一个物体受到两个共点力的作用，无论是在什么情况下，其合力( )。

A. The wind becomes fast and hot.
B. Air pressure gets steadily lower.
C. The black area moves closer.
D. They are knocked to the ground.