2008年的春节晚会中有一精彩的“手影戏”----《逗趣》。两位演员用手分别表演

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问题:

2008年的春节晚会中有一精彩的“手影戏”----《逗趣》。两位演员用手分别表演了动物、人物的各种形态。手影的形成是由于: [ ]

A.光的直线传播

B.平面镜成像

C.凸透镜成像

D.凹透镜成像

考点:光的直线传播现象
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As always, I am pleased to be here at the National Press Club for my (1) Speech. This is the seventh time I have had the (2) to give this speech, and over the years I have talked about a wide range of issues: (3) , reading, setting high expectations, improving the teaching profession, and (4) the American high school -- to name just a few.
I have just returned from a five-day, (5) tour of schools in rural America. We started in Monroe, Louisiana, and finished (6) later in Paducah, Kentucky. What I noticed most about the trip was the weather. Every time I (7) my Success Express School Bus, the local people who came to greet me (8) that the record for (9) had just been broken in their community. In each place, the temperature was always between (10) degrees.
Now, I have very good people on my staff. But the next time we plan a (11) , I’m going to have a (12) on my staff. I took this bus trip through rural America to make an important point that the (13) of children in our nation’s small towns cannot be ignored. Twenty-five percent of all our school children live in (14) all over America.
When it comes to our children, let’s always remember that children everywhere have (15) and (16) . Yet, schools in small towns too often have to (17) because of limited resources and a (18) . On my trip I put a p focus on the issues that matter in rural America, with a particular emphasis on (19) schools, reducing class size, and overcoming the (20) .

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一台黑白电视机出现垂直一条亮线的故障试分析原因。

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经济全球化的根本动力是()

A.市场经济制度在全球得到普遍的认可

B.以信息技术为基础的新技术革命的推动

C.国际金融的发展

D.跨国公司在全球的运作

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现行车船使用税属于()

A.中央税

B.地方税

C.中央、地方共享税

D.附加税

题型:选择题

液化石油气的爆炸极限为(),其爆炸范围宽且下限低,易爆炸燃烧。

A.0.5-9.5%

B.1.5-9.5%

C.0.5-19.5%

D.1.5-19.55%

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