[2014·皖南八校联考]不等式x2-2x+5≥a2-3a对任意实数x恒成立,则

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问题:

[2014·皖南八校联考]不等式x2-2x+5≥a2-3a对任意实数x恒成立,则实数a的取值范围为(  )

A.[-1,4]

B.(-∞,-2]∪[5,+∞)

C.(-∞,-1]∪[4,+∞)

D.[-2,5]

考点:一元二次不等式及其解法
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引起Ⅰ型呼吸衰竭的常见病因是()

A.肺部广泛炎症

B.慢性支气管炎

C.慢性阻塞性肺疾病

D.肺源性心脏病

E.上呼吸道阻塞

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天王补心丹和朱砂安神丸组成中均含有的药物是()

A.沙参、麦冬

B.玄参、天冬

C.麦冬、牛膝

D.当归、生地黄

E.天冬、当归

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阅读理解

     Would you like to be a king or queen? To have people waiting on you hand and foot? Many

Americans experience this royal treatment every day. How? By being customers. The American

idea of customer service is to make each customer the center of attention. Need proof? Just listen

to the commercials. Most of them sound like the McDonald's ad: "We do it all for you." Actually,

not all stores in America roll out the red carpet for their customers. But wherever you go, good

customer service means making customers feel special.

      People going shopping in America can expect to be treated with respect from the very beginning.

Most places don't have a "furniture street" or a "computer road" which allow you to compare prices

easily. Instead, people often "let their fingers do the walking" through the store hot lines. From the

first "hello", customers receive a satisfying response to their questions. This initial contact can help

them decide where to shop.

     When customers get to the store, they are treated as honored guests. Customers don't usually find

store clerks sitting around watching TV or playing cards. Instead, the clerks greet them warmly and

offer to help them find what they want. In most stores, the clear signs that label each department make

shopping a breeze. Customers usually don't have to ask how much items cost, since prices are clearly

marked. And unless they're at a flea market or a yard sale, they don't bother trying to bargain.

     When customers are ready to check out, they find the nearest and shortest checkout lane. But as

Murphy's Law would have it, whichever lane they get in, all the other lanes will move faster. Good

stores open new checkout lanes when the lanes get too long. Some even offer express lanes for

customers with 10 items or less. After they pay for their purchases, customers receive a smile and a

warm "thank you" from the clerk. Many stores even allow customers to take their shopping carts out

to the parking lot. That way, they don't have to carry heavy bags out to the car.

1. By quoting (引用) the McDonald's ad: "We do it all for you", the author intends to_______.

A. suggest that customers believe what commercials say deeply

B. show readers the American idea on good customer service

C. express all the stores pay much attention to the customers

D. persuade readers to choose the stores with ads correctly

2. In the USA, what may you do at first if you want to do some shopping?

A. To visit a professional street with lots of similar stores.

B. To compare prices in many shops in the same street.

C. To make phone calls and get better shopping choices.

D. To receive other customers' answers to the questions.

3. Which of the followings shows American stores offer convenience to customers in this passage?

A. The store clerks don't usually sit around watching TV or playing cards.

B. Some stores offer price bargain to the customers like a yard sale.

C. The clerks give customers a smile and a warm "thank you" after paying.

D. Some stores open new checkout lanes when the lanes are crowded.

4. Which of the following can be the best title of this passage?

A. Customer Service in America

B. Excellent Stores in America

C. Shopping Rules in America

D. Being King or Queen in America

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什么是期待视野,其有哪些层次?

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制造容积相同的情况下,球形容器要比圆筒形多消耗30%-40%的钢材。()

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