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(1)下列叙述中符合物理学史实的有( )
| A.托马斯·杨通过对光的干涉现象的研究,证实了光具有波动性 |
| B.卢瑟福通过“α粒子散射实验”的研究,发现了原子核是由质子和中子组成的 |
| C.麦克斯韦验证了电磁场理论,提出了光是一种电磁波 |
| D.贝克勒尔发现了天然放射现象,并提出了原子的核式结构学说 |
①当小车、车厢、物体以共同速度运动时,物体相对车厢的位移(设物体不会从车厢上滑下);
②从绳拉紧到小车、车厢、物体具有共同速度所需时间.(取g=10m/s2) 查看习题详情和答案>>
A. can b. need C. must D. should
分析材料,说说你的发现和感想。(3分)
(1)1969年7月16日人类首次登上月球,美国阿波罗11号飞船的三名宇航员阿姆斯特朗、阿尔德林、杰林斯说,他们从月球上肉眼能看到的人类最大建筑物是长城。
(2)小学语文课本第十二册第一课《长城》是一篇看图学文课。课文中写道:“飞往月球的宇航员所拍摄的地球照片上,能清楚的看到我国的长城”。
(3)杨利伟接受中央电视台主持人白岩松连线采访:
白岩松:还有一点是很多观众也非常关心的,你在整个飞行的20多个小时的过程中,看地球的感受是怎样的,有没有看到大家都在说的长城?
杨利伟:看地球景色非常美丽,但是我没有看到我们的长城。
我的发现和感想: 查看习题详情和答案>>
What can you do in two minutes? Cyrus Siu, 12, made a great speech in English and the hearts of everyone.
Siu studies at Singapore International School in Hong Kong. He the Junior high category (初中组) of the 11th “21st Century Cup” National High School and Primary School English Speaking Competition in Xiamen, Fujian on March 22.
His speaking skills and good English won him the top .
Siu said his first secret to success was many English books. He has read all the seven Harry Potter books, each four to five times. Now he is reading Steve Jobs: A Biography(《乔布斯传》)
“These books may be for my age, but reading helps me to learn new words,” he said.
Siu likes English-speaking movies. Super hero movies, Iron Man(《钢铁侠》) and The Avengers(《复仇者联盟》), are his favorite.
“Every boy has the dream of becoming a super hero one day. Sometimes I imagine
to be one of the heroes and shout out the English lines(台词). It’s good to combine(结合) your with learning English.
It’s also important to an English-speaking environment for yourself. Siu talks to his classmates and teachers in English all day long at school. his parents talk to him in Cantonese(粤语) at home, he still tries to answer in English.
“There is no shortcut(捷径) to studying English. Just practice, practice and practice!”Siu said.
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阅读下面的短文,从短文后各题所给的A、B、C、D四个选项中选出能填入空白处的最佳答案。
The 2010 Winter Olympic Games will take place in Vancouver and Whistler(惠斯勒) from February 12 to 28. As the world’s 41______ athletes will compete there, Canada is preparing for it well.
It will be broadcasted(播出) in Canada’s two 42______languages——English and French. Billions of television viewers worldwide will 43______ the opening ceremony of the 2010 Winter Olympic Games. Athletes from more than 80 44______ will compete in 86 medal events over 17 days. Then the Paralympics(残奥会) will 45______ from March 12 to 21. Canada has 46______ millions of dollars preparing. Thousands of spectators will visit the country. Canada will be 47_____ it all.
The building of Olympic gyms began in 2005. Opening and closing ceremonies will be held indoors, at BC Place Stadium. It’ll 48______55,000 seats. Some competitions, 49______ ski, and bobsled, will take place in Whistler. It’s a ski village. During the Games, roads will be closed. More than 15,000 policemen will work to 50______ the peace throughout the Games.
The United States is the only country to host the Winter Games four times. Team USA hopes 2010 will be a golden year.
41. A. worst B. best C. cleverest D. tallest
42. A. special B. unusual C. official D. ordinary
43. A. watch B. notice C. look D. hear
44. A. cities B. towns C. villages D. countries
45. A. run B. begin C. stop D. end
46. A. paid B. took C. cost D. spent
47. A. full of B. ready for C. worried about D. afraid of
48. A. give B. serve C. hold D. host
49. A. with B. including C. as D. so
50. A. keep B. make C. let D. protect
查看习题详情和答案>>It will be broadcasted(播出) in Canada’s two 【小题2】_____languages——English and French. Billions of television viewers worldwide will 【小题3】______ the opening ceremony of the 2010 Winter Olympic Games. Athletes from more than 80 【小题4】______ will compete in 86 medal events over 17 days. Then the Paralympics(残奥会) will 【小题5】_____ from March 12 to 21. Canada has 【小题6】_____ millions of dollars preparing. Thousands of spectators will visit the country. Canada will be 【小题7】_____ it all.
The building of Olympic gyms began in 2005. Opening and closing ceremonies will be held indoors, at BC Place Stadium. It’ll 【小题8】______55,000 seats. Some competitions, 【小题9】______ ski, and bobsled, will take place in Whistler. It’s a ski village. During the Games, roads will be closed. More than 15,000 policemen will work to 【小题10】______ the peace throughout the Games.
The United States is the only country to host the Winter Games four times. Team USA hopes 2010 will be a golden year.
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