玻璃钢夹砂管道埋地施工回填时，管区应对称（）回填，严禁单侧回填。

2010年诺贝尔物理学奖授予英国科学家安德烈•海姆和康斯坦丁•诺沃肖洛夫，以表彰他们在石墨烯材料方面的卓越研究．石墨烯是目前世界上已知的强度最高的材料，为“太空电梯”缆线的制造打开了一扇“阿里巴巴”之门，使人类通过“太空电梯”进入太空成为可能．假设有一个从地面赤道上某处连向其正上方的地球同步卫星的“太空电梯”．则关于该“电梯”的“缆线”，下列说法正确的是

A．“缆线”上各处角速度相同

B．“缆线”上各处线速度相同

C．“缆线”上各质点均处于完全失重状态

D．“缆线”上各处重力加速度相同

Many of us already know about several American superstitions(迷信). Having a black cat cross your path, walking under a ladder, and breaking a mirror are all bad luck. In addition to these, there are many other superstitions that are worth knowing. Understanding them will keep you safe from evil spirits—if you believe in such things—and impress your American friends when you mention them.

Like the superstitions in other cultures, American superstitions often involve the things important in daily life, such as health, numbers, and marriage. For example, have you ever had a cough that would not go away? According to one American superstition, you should take a piece of your hair and put it between two slices of buttered bread. Next, feed this hair sandwich to a dog and say, “Eat well, you hound, may you be sick and I be sound.”This will trick the evil spirits and help your cough. It will also raise some eyebrows if you try it.

In American superstitions, the number three is very important. Often, Americans will say, “All things come in threes.” Three is lucky because it represents the traditional family: mother, father, and child. Therefore, gifts, letters, and guests will often arrive at your home in groups of three. However, it is also possible for bad events, like accidents and funerals, to come in threes as well.

Another time people pay attention to superstitions is when they get married. During a wedding, brides must wear or carry“something old, something new, something borrowed, and something blue.”The old and borrowed things will bring luck to the person who gives them to the bride. The new and blue things will bring good fortune to the bride herself. The next time someone you know is getting married, be sure to recite this phrase.

As it would be unlucky to discuss one more superstition, we will wind things up here. Keep your fingers crossed, and stay lucky!

小题1:The passage is most probably entitled(命名)“       ”.

A．American’s Bad Luck

B．Cross-culture and Superstitions

C．American Superstitions

D．Daily Life in Superstitions小题2:The underlined sentence in the second paragraph“It will also raise some eyebrows if you try it”means:       .

A．When you try it, the dog will raise its eyebrows

B．You will make some people surprised when you try this trick

C．Only if you raise your eyebrows can the trick work

D．You will believe in the trick after you try it小题3:In American’s view, the number three is a(n)       number.

A．lucky

B．unlucky

C．special

D．ordinary小题4:On the wedding, the bride often uses old and borrowed things so as to       .

A．save some money for the wedding

B．bring good luck to the people who give them to the bride

C．give the good luck to the bride herself

D．pass the bad luck to others

如何用简单的方法判断轮带是否有滑移量？

第十一届中国国际航空航天博览会开幕式上，空军试飞员驾驶（）飞机在航展现场上空进行飞行展示，这是中国自主研制的新一代隐身战斗机（）的首次公开亮相。

A.歼-10

B.歼-20

C.歼-23

D.歼-31

客户非财务因素审查主要包括（）。

A.客户所处的行业市场地位分析

B.产品定价分析

C.生产技术分析

D.客户核心竞争能力分析