绿色食品分为A级和AA级两类,分类的主要依据是生产过程中,使用[ ] A.有害化

题型:选择题

问题:

绿色食品分为A级和AA级两类,分类的主要依据是生产过程中,使用[ ]

A.有害化学合成物的量不同

B.加工工具的不同

C.添加物的不同

D.基本原理的不同

考点:合理营养和食品安全
题型:选择题

有些大数值问题可以通过用字母代替数,转化成整式问题来解决,请先阅读下面的解题过程,再解答后面的问题.

例:若x=123456789×123456786,y=123456788×123456787,试比较x、y的大小.

解:设123456788=a,那么x=(a+1)(a-2)=a2-a-2,y=a(a-1)=a2-a,

∵x-y=(a2-a-2)-(a2-a)=-2<0,∴x<y.

看完后,你学到这种方法了吗?再亲自试一试吧,你准行!

问题:计算1.35×0.35×2.7-1.353-1.35×0.352

题型:选择题

阅读理解。

     People from all over the world like to travel to the US. Millions of people visit each year, and they

spend billions of dollars. Tourism is actually one of the leading industries.

      Many people like to visit famous U.S. cities, such as New York City, Washington D. C., Miami,

Chicago, Dallas, New Orleans, Denver, Los Angeles, or San Francisco. Each of those has many

tourist attractions. For example, New York has Broadway plays, and it has also some of the tallest

buildings in the world, such as The Empire State Building and The World Trade Center. The World

Trade Center which was 411 meters high and had 110 storeys with a twin tower used to be an office

building for 1,200 firms. But it was destroyed completely by the two planes of the terrorists on

September 11, 2001. Washington has government buildings as well as monuments and museums.

Dallas has the site of President Kennedy' murder. New Orleans has jazz music and the cities in

California have many ethnic groups with lots of good food. Disneyland in California and Disney

World in Florida are very popular attractions for tourists with children. The space center in Florida

and Texas are popular sites for people at all ages to visit.

     Some tourists prefer to find sites with natural beauty in rural settings. The mountains in the East

and the West are very popular with campers, hikers, and climbers. Some come just to ski and stay

in fancy ski resorts like Aspen or Vail. Others come just to golf at nice golf resorts like Pinehwst,

which is partly owned by Japanese who love golf. Some come to watch sports, but tickets can be

expensive. It costs $100 just to get a back row seat to see a Chicago Bulls game. Two of the most

popular places for tourists to visit are Grand Canyon and Yellowstone Park. At times Yellowstone

Park is so crowded with tourists that it almost seems like a city. With the growing popularity at

country music, many people now visit Nashville where most of the recordings are made or Branson

where many stars have their own theatres.

1.Today a tourist visiting New York can not visit ____.

A. Broadway.                      

B. The Empire State Building

C. The World Trade Center            

D. New York Port

2.If you are interested in politics, the city that you are most likely to visit is ____.

A. Washington  

B. New York    

C. New Orleans  

D. Chicago

3.The following places are some attractions which have something to do with music except ___.  

A. Nashville    

B. Branson      

C. New Orleans  

D. Dallas

4.Which of the following is NOT true?

A.Disneyland in California and Disney World in Florida are the favorite attractions for the

children.                    

B.Texas is the only space center in the U.S..

C.Japanese are fond of golf.      

D.It can be very cold in Aspen and Vail in winter

题型:选择题

一位哲人这样解释乐观与悲观:譬如面对着桌子上的半杯水,乐观主义者说这个杯子的一半是满的,悲观主义者说这个杯子的一半是空的。显然,______,使我们在任何时候、任何条件下都不会失去信心和追求。一旦遇到困难,我们黯淡的心情也能够很快豁然开朗,从种种苦恼中自我解脱。填入划线上最恰当的是:

A.人与人的观察角度和思维方式是不同的

B.观察事物时善于选择生活中积极的一面

C.乐观主义比悲观主义更有利于人类进步

D.这两种理解有其合理性也有一些片面性

题型:选择题

封端混凝土浇筑后,应静置多久,并带模浇水养护?()

A.1小时-2小时

B.2小时-3小时

C.3小时-3.5小时

题型:选择题

在相同等高距的地形图中,等高线平距越小处,地面坡度越缓,等高线平距越大处,地面坡度越陡。

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