计算下列各题：（1）2aa+b÷2aba2-b2（2）2xx2-4y2-1x-2

可侵犯甲的疾病有（）。

A.银屑病

B.玫瑰糠疹

C.扁平苔癣

D.手足癣

阅读理解。

     "But I just paid 1. 69 for this bottle of wine last week. How is it that the price is 2.25?"

     There are at least three things going on that have caused the price of wine to rise. All have to do

with the supply and demand factors of economics.

     The first factor is that people are drinking more wine than ever before. This demand formore wine

has increased wine sales in America at the rate of 15 percent a year.

     The second factor is that the supply of wine has stayed relatively the same, which meansthat the

same number of bottles is produced each year. Wine producers are trying to open upnew land to

grow more grapes. But in at least three wine producing areas of the world-France,Germany, and

California - new vineyards (葡萄园)will not be useable in the near future. Wines are produced in

other countries, such as Italy, Spain, and Portugal, as well as Argentine,Australia, Austria, and Chile.

And these wines will be seen more often on the American market. But none of these countries will be

able to fill the good wines.

     The third factor is that costs of wine production are soaring. The workers who make wine are

asking for more money, and the machinery needed to press the grapes is becoming more expensive.

     When the demand for something is greater than the supply, prices go up. When productioncosts,

meaning the price of labor and machinery rise, the producer adds this increase to the price of the wine.

For these reasons, that bottle of wine now costs 2. 25 instead of 1. 69.

1. What is the main idea of this passage?

A. Every year people drink more wine.

B. Countries won't be able to fill the demand for good wines.

C. The prices of things go up when the demand for them is greater than the supply.

D. The supply of wine will always be less than demand.

2. This passage is written to.

A. describe where wine is produced

B. persuade people drink more beer

C. explain why the price of wine is rising

D. describe why wine is a favorite drink to many Americans

3. The underlined word "soaring" means".

A. adding quickly

B. reducing fast

C. demanding badly

D. increasing fast

小林同学学习很刻苦，晚上常常学习到深夜，就连星期天也不休息，可他成绩并没有提高，他很难过，又找不出原因。你认为小林同学学习成绩没有提高的主要原因是[ ]

A．小林不够刻苦和勤奋

B．小林没有掌握科学的学习方法，要学会做学习的管理者

C．小林的学习时间时间太少

D．小林学习态度不够认真

赤陶土

实施多种激励措施？