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

选择题
阅读理解

阅读理解。

     When something goes wrong, it can be very satisfying to say, "Well, it's so-and-so's fault." or "I know

I'm late, but it's not my fault; the car broke down." It is probably not your fault, but once you form the habit

of blaming somebody or something else for a bad situation,you are a loser. You have no power and could do

nothing that helps change the situation. However, you can have great power over what happens to you if you

stop focusing on whom to blame and start focusing on how to remedy the situation. This is the winner's key

to success.

     Winners are great at overcoming problems. For example, if you were late because your car broke down,

maybe you need to have your car examined more regularly. Or, you might start to carry along with you the

useful phone numbers, so you could call for help when in need. For another example, if your colleague (同事)

causes you problems on the job for lack of responsibility or ability, find ways of dealing with his irresponsibility

or inability rather than simply blame the person. Ask to work with a different person, or don't rely on this

person. You should accept that the person is not reliable and find creative ways to work successfully regardless

of how your colleague fails to do his job well.

     This is what being a winner is all about-creatively using your skills and talents so that you are successful

no matter what happens. Winners don't have fewer problems in their lives; they have just as many difficult

situations to face as anybody else. They are just better at seeing those problems as challenges and opportunities

to develop their own talents. So, stop focusing on "whose fault it is." Once you are confident about your power

over bad situations, problems are just stepping stones for success.

1. According to the passage, winners _____. [ ]

A. deal with problems rather than blame others

B. meet with fewer difficulties in their lives

C. have responsible and able colleagues

D. blame themselves rather than others

2. The underlined word remedy in Paragraph 1 is closest in meaning to _____. [ ]

A. avoid

B. accept

C. improve

D. consider

3. When your colleague brings about a problem, you should _____. [ ]

A. find a better way to handle the problem

B. blame him for his lack of responsibility

C. tell him to find the cause of the problem

D. ask a more able colleague for help

4. Which of the following is the best title for the passage? [ ]

A. A Winner's Opportunity.

B. A Winner's Secret.

C. A Winner's Problem.

D. A Winner's Achievement.