关于合力与其两个分力的关系，下列说法中正确的是（） A．合力的作用效果与两个分力共同
题型：多项选择题
问题：
关于合力与其两个分力的关系，下列说法中正确的是（）
A．合力的作用效果与两个分力共同作用的效果相同
B．合力和分力同时作用在物体上
C．合力大于它的任一分力
D．合力大小可能等于某一分力的大小
题型：多项选择题
阅读理解
One day Mr. Robinson saw a woman in the street with ten children. He was very surprised because
all the children were wearing the same clothes-white hats, blue coats and white pants.
"Are all those children yours? "he asked the woman.
"Yes, they are," she answered.
"Do you always dress them in the same clothes?"asked Mr. Robinson.
"Yes," answered the mother,"When we had only four children, we dressed them in the same clothes
because we didn't want to lose any of them
. It was easy to see our children when they were among (在……中间) others because they were all wearing the same clothes. And now, when we have ten,
we dress them like this because we do no
t want to take other children home by mistake(错误). When
there are other children among ours, it is easy to see them because their clothes are different."
1. One day __________.
A. Mr. Robinson met a woman teacher with 10 school children
B. Mr. Robinson met 10 children with their moth
er
C. the mother met Mr. Robinson with 10 school children
D. the mother met Mr. Robinson with his 10 children
2. -Why was Mr. Robinson surprised when he saw the ten children?
-Because he saw that __________.
A. they all had the same look
B. they were all the mother's children
C. the woman had so many children
D. they were all dressed in the same way
3. When did the mother begin to dress her children in the same clothes?
A. Just after she had the fourth child.
B. Just before the mother had ten children.
C. When she met Mr. Robinson in the street.
D. When she didn't want to take other children home by mistake.
4. According to (根据) the story, we know that __________.
A. all the ten children are boys who are wearing the same clothes
B. all the woman's children are girls who are in the same clothes
C. the children's clothes had the same colour
D. the ten children are both the woman's and Mr. Robinson's children
5. When the woman has ten children, she dresses them in the same clothes because __________.
A. the mother wants to show it to Mr. Robinson
B. she doesn't want to take other children by mistake
C. she wants to take them to walk in the street
D. it's very easy to find them in the street