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: What were the first animals to be launched into space?[音频]

A. Dogs.
B. Fruit flies.
Cats.
D. Monkeys.

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Task 1: There are five short dialogues about space explorations. Listen carefully, and choose the best answer to each question.Q: How many school teachers were on board the Challenger space shuttle when it exploded?[音频]

A. 1
B. 2
C. 3
D. 5

Task 1: There are five short dialogues about space explorations. Listen carefully, and choose the best answer to each question.Q: How many rovers have been dispatched to Mars?[音频]

A. 3
B. 4
C. 5
D. 6

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

下列有关函数的极限的描述，错误的是：

A. 函数的极限是指函数的变化趋势，它与自变量的变化过程有关
B. 函数的极限就是函数的特殊值
C. 当x->1时，函数sinx 无限接近于sin1
D. 分段函数的极限值要分析它的左右极限问题