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（1）实验中，小明是通过观察 ▲ 来比较压力作用效果的．
（2）比较甲、乙两图所示实验，能够得到的结论是： ▲
（3）若要探究“压力的作用效果与受力面积大小的关系”，应通过比较图 ▲
所示实验．
（4）小华同学实验时将物体B沿竖直方向切成大小不同的两块，如图丁所示．他发现
它们对泡沫的压力作用效果相同，由此他得出的结论是：压力作用效果与受力面积无关．你认为他在探究过程中存在的问题是： ▲ ． 查看习题详情和答案>>
The fishermen knew little about the island when they there.
(A) arrived (B) would arrive (C) arrive (D) have arrived
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Bob was cutting a branch（树枝） off a tree in his garden. While he was sawing（锯）, another man passed in the street. He stopped and said, “ Excuse me, but if you continue (继续)to saw（锯） that branch like that, you will fall down with it.” He said this because Bob was sitting on the branch and cutting it at a place between himself and the trunk（树干） of the tree.
Bob said nothing. He thought, “ This is some foolish（愚笨的） person who has no work to do and goes about telling other people what to do and what not to do.”
The man continued on his way. Of course, after a few minutes. The branch fell and Bob fell with it.
“My God!” he cried. “That man knows the future!” and he ran after him to ask how long he was going to live. But the man had gone.
1.One day Bob was cutting a branch_______a tree in his garden.
|
A．on |
B．in |
C．at |
D．off |
2.While Bob was sawing, another man_______.
|
A．told him to stop working |
B．told him he would fall down |
|
C．would borrow something from him |
D．would help him saw that branch |
3.After hearing the man’s words, Bob thought that________.
|
A．that was a foolish person. |
B．that was a wise person |
|
C．that was a proud person |
D．that fellow cheated him |
4.What happened to Bob after a few minutes?
A. The branch fell. B. Bob fell down to the ground.
C. Bob was hurt himself. D. Both A and B.
5.This story is about ________.
|
A．a foolish man |
B．a wise man |
C．cutting a tree |
D．that we need to take good advice |
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