问题 选择题
如图所示,AB是一质量为m的均匀细直杆,A端靠在光滑的竖直墙壁上,B端置于水平地面上,杆身与竖直方向夹角为θ,杆与地面的摩擦系数为μ,保持平衡,则此时杆与地面的摩擦力为(  )

A.mgtgθ

B.mgsinθ

C.μmg

D.μmg

答案

答案:A

单项选择题 A3/A4型题
阅读理解

阅读理解。

阅读下面短文,用英语简要回答文后所给的5个问题。

     I remember a time I went shopping on my first visit to Macau. Coming from cold and cloudy England, I

was prepared for the sun and dressed in a T-shirt and a short skirt. Not having much chance to enjoy the sun

in the UK and having naturally fair skin, my legs are very white. In the UK this is not a fashionable (时尚的)

look at all. Most women spend every sunny day out in the sun trying to get darker skin. The darker the skin,

the better the look.

     As I walked around one shop, two shop assistants didn't take their eyes off me the whole time, talking

quietly in Chinese. I began to feel uncomfortable and asked my friend if we could leave. After we left the shop,

she asked me what was wrong. I was embarrassed that they were talking about my white skin. My friend

laughed."They weren't laughing at you. They were saying how nice your legs are. Many Chinese women want

to have white skin like yours. In fact, there are many beauty products in the shops to make skin whiter and a

lot of money is spent on them."

     It just goes to show that we always think what others have is better. The grass is always greener on the

other side. If the women of the West and East thought the same way, Western women wouldn't spend so

much money on cream that makes skin darker and women from the East wouldn't need to use cream that

makes skin whiter.

1. Where did the story happen?

____________________________________________________________________

2. What kind of skin do most British women prefer to have?

____________________________________________________________________

3. Why did the writer think the shop assistants were laughing at her?

____________________________________________________________________

4. What were the shop assistants talking about?

____________________________________________________________________

5. What does the underlined sentence "The grass is always greener on the other side" mean?

____________________________________________________________________