在停机过程中胀差容易出现负值。（）

不足5件的或贵重药材( )

A．砂仁
B．金银花
C．地黄
D．延胡索
E．三七

2008年中央财政安排用于“三农”各项支出合计5625亿元，增加1307亿元，增长30.3%。中央财政加大对“三农”投入的力度，有利于（   ）

①加强国民经济的基础       ②促进财政的收支平衡

③提高人民的生活水平       ④促进经济社会协调发展

A．①②③

B．①②④

C．①③④

D．②③④

若某一计算机光驱为50倍速的，那么它的传输速率为

A．5000KB/s

B．5 500KB/s

C．7 500KB/s

D．10000KB/s

某商场在开业前要选择经营商品的种类，现有甲、乙、丙、丁四类商品可供选择。由于对未来市场需求无法做到比较精确的预测，只能大致估计为：需求量较高、需求量中等、需求量较低三种情况。这三种情况的预计损益值如下表所示：

用乐观准则选择比较满意的品种是（）。

A．甲

B．乙

C．丙

D．丁

阅读理解。

                                                                The Water Road

      In October 1825, the Seneca Chief traveled from Buffalo to New York City. It was the first time a boat

went all the way from the Great Lakes to the Atlantic Ocean.

     In the early 19th century, transportation had become important to America. Companies needed to send their

goods to distant markets. Farmers needed to send their crops to people in the cities. Pioneers wanted to travel

west to find farm land. It was hard to build roads through the wilderness (荒无人烟的地区), so waterways

were often used for transportation. But people still had to travel over land to get from one waterway to another.

      Canals (运河) were one way to solve the problem. The Erie Canal connected the Hudson River( near New

York City) with the Great Lakes. It made the Seneca Chief' s journey possible.

     It took two years and cost $ 7 million to build the Erie Canal. But it was worth the price. Before the canal

opened, it cost $ 100 a ton to ship goods between Buffalo and New York City. After it was built, the cost was

$ 10 a ton. Before the canal, the journey between Buffalo and New York City took 20 days. With the canal, it

took eight days.

      Today we can go from Buffalo to New York City in a matter of hours. Back in 1825, though, there were

no cars or highways or airplanes.

1. How many days would be saved if one took a trip from Buffalo to New York City after the

    Erie Canal was built?

A. 8 days.

B. 10 days.

C. 12 days.

D. 20 days.

2. What can we know from the passage?

A. The Hudson River connects New York City with Buffalo.

B. Most waterways are connected with others.

C. The Seneca Chief's journey would fail without the Eric Canal.

D. The Hudson River flows into the Pacific Ocean.

3. The second paragraph is mainly about _____.

A. the American people in the 19th century

B. how the Erie Canal was built

C. the reason to build a canal

D. how the waterway was connected to another