问题 选择题

忽略空气阻力,下列几种运动中机械能守恒的是

A.石块被水平抛出后在空中的运动

B.物体沿光滑斜面下滑的运动

C.物体自由下落的运动

D.子弹射穿木块的运动

答案

ABC

当只有重力做功的时候,物体的机械能守恒,所以ABC选项中,物体在运动过程中只受重力,所以机械能守恒,D中子弹受到木块的阻力,阻力做负功,所以机械能不守恒,故选ABC

阅读理解

When Peng Liyuan stepped off the plane in Moscow, the whole world wanted to know who dressed the elegant first lady. The reporter released the secret—Ma Ke.

Peng Liyuan has been wearing Ma Ke’s designs for more than a decade, a fact that was only highlighted recently when she was on her first state visit, accompanying her husband President Xi Jinping. The elegant and attractive Peng, formerly a popular singer, has been compared with the US’ first lady Michelle Obama and France’s Carla Bruni-Sarkozy, since stepping off the airplane in Moscow on March 22. Suddenly, everyone was curious to know more about the first lady’s wardrobe.

Even so, Ma prefers a low-key approach. “If you eat a tasty egg why would you want to see the hen?” she says of all the media attention.

Ma’s relationship with Peng began 10 years ago after a concert in Guangzhou when a reporter told Peng she knew the designer behind the label Exception de Mixmind. Peng asked for an introduction because she was a fan of Ma’s designs and had been wearing them for years.

The two naturally became friends. Ma says, “The painting reflects the painter, and clothes reflect both the designer and the wearer. Someone desires fame and wealth, or love and sympathy; what you have in your heart is reflected in the design. Those who don’t share my philosophy won’t buy my clothes. Peng is a caring person, devoted to charity and environmental protection, which is exactly what I’m doing now.”

However, regardless of the brand, Peng’s support of Chinese labels has surprised millions of Chinese who favor foreign fashion brands.

“Instead she presented a vision of Chinese fashion, desiring to bring Chinese designers to the world stage,” says a western designer.

The first lady’s double-breasted coat and her black leather handbag aren’t available at any of Exception’s shops, though Exception’s physical stores do have seen a rising number of visitors.

小题1:In the underlined sentence in Paragraph 3 Ma Ke mentioned “an egg and the hen” to show       .

A.it is hard to explain “Which came first, the egg or the hen?”

B.paying such great attention to her was unnecessary

C.the outcome was more important than the process

D.her dissatisfaction with the media attention on her dress小题2:What can be inferred from the passage?

A.First ladies compete with each other whenever they are together.

B.Peng’s suits can be bought in Ma Ke’s clothes stores.

C.Ma Ke offered to design the first lady’s clothes through her friends.

D.Peng had liked Ma’s designs long before she got to know her in the flesh.小题3:In the passage, Peng Liyuan              .

A.often reflects on what she has in her heart before choosing clothes

B.is sympathetic and has a strong environmental consciousness

C.always desires the exceptional charm of the brand

D.is knowledgeable in philosophy小题4:Which of the following statements is NOT true according to the passage?

A.Peng wears the dress designed by a Chinese designer probably to support Chinese brands.

B.Many citizens found Peng Liyuan’s choice quite unexpected.

C.Black leather handbags like Peng’s are widely sold in bag stores in big cities.

D.After Peng Liyuan’s visit to Moscow Ma Ke’s clothes became more popular.

判断题