所谓无公害蔬菜是指蔬菜中有害物质(如农药残留、重金属、亚硝酸盐等)的含量,控制在

题型:论述题

问题:

所谓无公害蔬菜是指蔬菜中有害物质(如农药残留、重金属、亚硝酸盐等)的含量,控制在国家规定的允许范围内,人们食用后对人体健康不造成危害的蔬菜。无公害蔬菜的种植过程中,为了确保质量,无公害蔬菜的选种、试种、田间管理、采摘、运输各个环节成本都大大高于传统蔬菜,因此,无公害蔬菜的价格比普通蔬菜高2~3倍。

运用“影响价格的因素”说明无公害蔬菜的价格比普通蔬菜高2~3倍的原因。(6分)

考点:时事
题型:论述题

如果切断电源,()存储器存储的数据就丢失,所以其只适应于暂时保留控制过程中的处理数据。

A、RAM

B.CPU

C.ROM

题型:论述题

中国人民银行决定,从2011年2月24日起,再上调存款类金融机构人民币存款准备金率0.5个百分点,达到19.5%的高位,这是自去年以来连续8次上调存款准备金率。上调存款准备金率

①将会减少流通中的货币量           ②是国家运用货币手段进行宏观调控

③有助于抑制通货膨胀风险           ④提高了储蓄存款的收益

A.①②③

B.②③④

C.①③④

D.①②④

题型:论述题

One day newly wedded Nancy lost her ring while helping to plant potatoes. Friends were called and the field was searched long but in vain. Later, when the pottoes were harvested, Everyone looked out for the ring but it remained lost. Another year came round and all the farmers working in the field kept their eyes open. The following year was the same. And year after year, whoever had business in the field aways had Nancy’s ring in his mind.

Then the farm changed hands but it went no farther than to cousins. So the memory of the lost ring remained alive until thirty-eight years had passed. Then came a spring day when a man was ploughing the field behind a pair of horses. Even after thirty-eight years he still looked out for the ring, and knew just which part of the field Nancy had lost it in. At this time, when he came there, he found it .He picked it up, put it carefully into his pocket, left his horse, and ran all the way down to the village and placed it into Nancy’s hand.

76.How did Nancy come to lose her ring?

A.She lost it while helping to harvest tomatoes in the field

B.She lost it while watering the plants in the field.

C.She lost it while working in the field.

D.She lost it while helping to plant potatoes in the field.

77.What was done so that the lost ring could be found?

A.Friends were asked to join in the search.

B.The field was searched for a long time.

C.Dogs were called to look for it.

D.Both A and B

78.Why did people keep looking for the ring even after the farm changed hands?

A.It was a very expensive ring

B.They all wanted to solve the mystery.

C.They all loved Nancy.

D.Everybody wanted to have this ring.

79.What did the ploughman do after finding the ring?

A.He picked it up and put it in his pocket.

B.He ran back to tell everybody in the village.

C.He placed it in a secret spot.

D.He returned it to the owner.

80.What can you infer from the story?

A.The ring was invaluable.

B.People on the farm were honest and helpful.

C.The ring’s mysterious disappearance was the work of supernatural power.

D.Nancy no longer expected that her ring would be found again.

题型:论述题

散热器一般布置在外墙窗台下,这样可以直接加热由窗缝()的冷空气,使房间内的温度分配均匀。

A、透入

B、侵入

C、进入

D、渗入

题型:论述题

发电厂与变电所中,110kV屋外配电装置(无含油电气设备)的火灾危险性应为下列哪一类?

A.乙类

B.丙类

C.丁类

D.戊类

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