在软件开发中，下面任务不属于设计阶段的是A．数据结构设计 B．给出系统模块结构 C．

下图1～3是三种常用化肥包装袋上的部分说明．

（1）图l中化肥名称方框中合适的名称应为______．图2提示保存碳酸氢铵应注意______．图3所示这一袋化肥含氮元素的质量为______ kg，根据包装袋上含氮量计算这包尿素的纯度可达______．

（2）根据农技员计算，小军家小麦地需要28kg氮元素，而小红则建议他买含氮量高的化肥，到供销社后，小军面对下述化肥（纯度100%）价格表犹豫不决．请你帮他计算一下，买下列哪种氮肥最实惠，应买多少公斤？

价格表
品种	NH4HCO3	NH4NO3	CO（NH2）2
价格 （元/kg）	0.54	1.05	1.25

你认为应买______，应买______kg．

Today just as technology changed the face of industry, farms have undergone an “agricultural revolution”. On the farm of today, machines provide almost all the power.

One of the most important benefits will be the farm computer. A few forward-looking farmers are already using computers to help them run their farms more efficiently. The computers help them keep more accurate records so they can make better decisions on what crops to plant, how much livestock to buy, when to sell their products, and how much profit they can expect. Many computer companies have been developing special computer programs just for farmers. Programs are being written for hog producers, grain farmers, potato farmers, and dairy farmers. In the future, farmers will be able to purchase computer programs made to their needs. Because of the growing importance of computers on the farm, students at agricultural colleges are required to take computer classes in addition to their normal agricultural courses. There can be no doubt that farmers will rely on computers even more in the future. While the old-time farm depended on horse power, and modern farms depend on machine power, farms of the future will depend on computer power.

　　Another technological advance which is still in the experimental stage is the robot, a real “mechanized hired hand” that will be able to move and, in some ways, think like a human being. Agricultural engineers believe that computer-aided robots will make startling changes in farming before the end of the century. Unlike farmers of the present, farmers of the future will find that many day-to-day tasks will be done for them. Scientists are now developing robots that will be able to shear sheep, drive tractors, and harvest fruit. Even complex jobs will be done by robots. For example, in order to milk their cows, farmers must first drive them into the barn, then connect them to the milking machines, watch the machines, and disconnect them when they are finished. In the future, this will all be done by robots. In addition, when the milking is completed, the robots will automatically check to make sure that the milk is pure. The complete mobilization of the farm is far in the future, but engineers expect that some robots will be used before long.

小题1:Which sentence carried the main idea of the whole passage?

A．The first sentence of the first paragraph.

B．The first sentence of the second paragraph.

C．The first sentence of the third paragraph.

D．The last sentence of the second paragraph.小题2: according to the passage, computers can not help farmers decide _______.

A．how much money they can earn from their products

B．whether to plant a certain kind of crop

C．what livestock to raise

D．when to sell their products小题3:Which of the following statements is true?

A．Farmers in the future will depend totally on computers.

B．Both computers and robots have been in use on today’s farms.

C．Farmers mainly use machines on their farms at present.

D．Students at agricultural colleges must take computer classes because they can do nothing without the help of computers on today’s farms.小题4:according to the engineers, _______will be done by robots in the near future.

A．all farm work

B．milking cows

C．most of the farm work

D．some farm work小题5:What is the best title for the whole passage?

A．Computer, Farmers’ Best Friend

B．Farmers in The Future

C．The Agricultural Revolution

D．Computers and Robots

以幼虫潜叶为害，虫道细而均匀，从叶缘向中部扩展的是（）

A.美洲斑潜蝇

B.番茄斑潜蝇

C.豌豆潜叶蝇

D.南美斑潜蝇

税法规定，所得税税额抵免限额的规定，仅适用于( )。

A．中外合资经营企业

B．中外合作经营企业

C．外资企业

D．总机构设在中国境内的外商投资企业

面向对象的模型中，最基本的概念是对象和　【3】　。