阅读理解
We drink tea every day. But more than three hundred years ago most of the people in
Europe(欧洲) did not know anything about tea. Some people heard about it, but very few
of them know what to do with it.
There is a story about an English sailor(水手) who went to countries in the east, the west
and the south. He went to India and China. One day he came home and brought some tea as
a present for his mother. She told her friends about the present and asked them to a "tea party".
When her friends came to the "tea party", the old woman gave them brown tea-leaves. The old
woman's friends began to eat them. Of course, nobody liked the tea-leaves.
At that time the sailor came in. He looked at the table and said, "Mother,what did you do
with the tea?"
"I boiled it,as you said."
"And what did you do with the water?"
"I threw it away(扔掉),of course." answered the old woman.
"Now you may throw away the leaves,too," said her son.
1. Most of the people in Europe __________ 300 years ago.
A. drank tea eve
ry day
B. knew everything about tea
C. knew nothing about tea
D. liked to eat the tea-leaves
2. One day the English sailor brought his mother some tea from __________.
A. countries in the west
B. countries in the south
C. India or China
D. a tea shop in England
3. The sailor's mother asked her friends to her house, because __________.
A. the sailor told her to
B she liked to show off(炫耀)
C. she wanted to ask her friends what to do with the tea
D. she wanted to taste the tea together with her friends
4. At the "tea party", __________.
A. all the woman's friends spoke highly of(高度评价) the tea
B .nobody knew what to do with the tea
C. the woman didn't eat the tea-leaves
D. the woman gave her friends each a glass of tea water
5. What mistake(错误) did the old woman make? She __________.
A. boiled the tea
B. did as the sailor said
C. threw away the water
D. didn't throw away the tea-leaves
，蓄电池组至直流主屏电缆所允许的最大电阻R=ΔU/I=1.1/328=1.84/S，由此S=548.6。