关于潮汐，古人说：“潮者，据朝来也；汐者，言夕至也.”图10-6-1是利用潮汐发电的示意图.左方为陆地和海湾，中间为大坝；其下有通道，水经通道可带动发电机.涨潮时，水进入海湾，待内外水面高度相同，堵住通道［图10-6-1(甲)］，潮退至最低点时放水发电［图10-6-1(乙)］；待内外水面高度相同；再堵住通道，直到下次涨潮至最高点，又放水发电［图10-6-1(丙)］.设海湾面积为5.0×107 m2，高潮与低潮间高度差3.0 m，则一天内水流的平均功率为_____MW.
图10-6-1
(注：实际上由于各种损失，发电功率仅为水流的平均功率的10%—25%.例如法国兰斯河(the Rance River)潮汐发电站水势能释放平均功率240 MW，而发电功率仅为62 MW)
名校课堂系列答案科目：高中英语 来源： 题型：单选题
There were so many people on the platform waiting to ____ the train that we gave it up.
| A．check | B．carry | C．find | D．board |
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科目：高中英语 来源： 题型：
Of all ______reasons for my decision to major in social work, my father’s advice was _______most important one.
A. the; a B.不填；a C.不填;the D. the; the
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科目：高中英语 来源： 题型：阅读理解
With his standard Mandarin pronunciation, practiced skills on Chinese expressions and special humor with a Peking accent, Dashan has become a household name across
People have always wondered how the 36-year-old Canadian can be so skillful in the Chinese language even though it is considered by many as one of the most difficult languages in the world. But to Dashan, the great challenge was a piece of cake due to his deep interest, proper method and the excellent environment he created for himself.
“Interest is the best teacher.” That is a universal principle. Even if he hadn’t fully realized what attracted him to the Chinese department at the University of Toronto in
Entering the Chinese department of
As a freshman at the
However, that’s far from enough to grasp the Chinese language. Starting in his junior year, Dashan began to read original Chinese novels, Chinese newspapers and even the Selected Works of Deng Xiaoping. “Only the material for Chinese native readers could give me a proper sense of the language,” he said.
That the language is the daily means of communication is the principle that Dashan always keeps in his mind. What you have really learned depends on what you can use, not necessarily your mastery of textbooks.
To learn in daily life requires a favourable language environment, which is also necessary for improvement. Dashan admits it is hard for Chinese English learners to be brought into a good English speaking environment, but he insists, “To listen and speak as much as possible does help.”
64. Dashan could learn Chinese very well because of _______.
A. his interest, method and study environment
B. practiced skills on Chinese expression
C. his cleverness
D. special humour with a Peking accent
65. The sentence “Learn for life and learn in life” here means “_______”.
A. learn things in our daily life, otherwise it will not last long
B. we should study in practice all our lives
C. life is difficult, so we’d better learn more to lead a better life
D.language is the necessary part of our daily life, so we must practise it frequently
66. The underlined phrase “a piece of cake” here refers to “_______”.
A. 吸引人的事情 B. 容易的事情
C. 很难的事情 D. 富有刺激性的事情
67. Dashan read the Selected Works of Deng Xiaoping because _______.
A. he admired the former leader of the government
B. he hoped to learn more of the spirits of it
C. he wanted to give himself a proper sense of the Chinese language
D. it is very popular in modern times
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科目：高中英语 来源： 题型：
How proud she is! She has been
A．admitted to B．agreed to
C．received by D．had watched
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科目：高中英语 来源： 题型：单选题
The traffic is heavy these days.I ________ arrive a bit late，so could you save me a place?
| A．can | B．must | C．need | D．might |
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