问题 不定项选择

如图所示,楔形木块静置于水平粗糙地面上,斜面与竖直墙之间放置一表面光滑的铁球,斜面倾角为θ,球的半径为R,球与斜面接触点为A。现对铁球施加一个水平向左的力F,F的作用线通过球心O,若缓慢增大压力F,在整个装置保持静止的过程中

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A.斜面对铁球的作用力缓慢增大

B.斜面对铁球的作用力大小不变

C.斜面对地面的摩擦力缓慢减小

D.任一时刻竖直墙对铁球的作用力都大于该时刻的水平外力F

答案

答案:D

解答题
阅读理解

B

The resounding film Avatar has been very popular in the UK and around the world, becoming the fastest film ever to earn $1bn(7bn yuan) in ticket sales.  

But as well as being an entertaining feast for the eyes, the sci-fi epic(叙事诗)also introduces the audience to a brand new language invented especially for the film.

The movie is set on an alien planet called Pandora which is inhabited by many strange species. The most humanoid of the planet’s inhabitants are the Na’vi, and it is the struggle between the Na’vi  and human invader that forms the main story of the film.

The film has been released in 2D and 3D versions.

In order to add a sense of reality to his vision of an alien race the film’s director James Cameron asked a professor of language form the University of Southern California to invent a language for the Na’vi.

Professor Paul Frommer worked with James Cameron for four years to build upon the original 30 words or so that the director had already come up with for the language.

According to Professor Frommer, the most important aspect of the Na’  vi language was that it could be pronounced.

“This is an alien language but obviously it has to be spoken by human actors,” Professor Frommer told the BBC, “it has to be sounds that human beings are comfortable producing.”

The language currently has around 1,000 words but Professor Frommer hopes to expand it in possible sequels(续集)to the film and in video games.

The professor hopes that one day his creation will have a high level of the Klingon alien language from the Star Trek films.

“There’s a translation of Hamlet into Klingon,” says Professor Frommer.

“If anything happened like this with Na’vi I’d be delight.”

60. The underlined word “resounding” in Paragraph 1 mean_________.

A. later   B. scientific    C. hit      D. surprising

61. Which of the following is Right according to the passage?

A. A kind of new language was invented especially for the film

B. The film Avatar is as good as a film as the Star Trek

C. The creation in Alien Language is different from that in human beings.

D. Avatar is one of an excellent films invented by Pandora.

62. The most challenging part in the creation of the language is_________.

A. that Professor Frommer needs to create 1,000 words for the film Avatar by himself.

B. that the language is based on that of the Alien planet called Pandora

C. that James Cameron introduces a new style of language to the audience

D. that an Alien language is created to be spoken by human beings.

63. We can infer from the passage that_________.

A. the film Avatar has been released in 2D and 3D versions.

B. the most important aspect of the Na’vi language was that it could be pronounced.

C. Professor Paul Frommer believe his language creation in the film Avatar is very successful.

D. Professor Paul Frommer worked with James Cameron for four years for a sense of reality of the film.