题目内容

Task 1: There are five short dialogues about space explorations. Listen carefully, and choose the best answer to each question.Q: Which two nations are beginning to make contributions to the development of space exploration?[音频]

A. Russia and the United States.
B. Russia and China.
China and India.
D. The United States and China.

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下列有关函数的导数的描述,正确的是.

A. 函数的导数就是把一个函数倒过来
B. 函数的导数反映出函数的变化率
C. 运动物体的加速度是反映位移对时间的导数
D. Y=2x-1的导数是4