正确答案: B

开垦草原

题目：由于人为因素，造成食物链缩短的有( )

解析：B

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举一反三的答案和解析：

[单选题]29．The skirt is________

Band C

解析：29．D【解析】由短文第三、四句中及文末对其价格的介绍“The skirt is 15 dollars.”可知，B项和 C项都符合文意，故选D．

[单选题]（09赤峰）关于电磁波，下列说法正确的是（ ）

红外线是一种电磁波，紫外线也是

[单选题]下面各项中表述错误的一项是( )(2分)

《白杨礼赞》的作者是陆蠡，他是现代著名作家。

[单选题]Mary ________ vegetables．

doesn’t like

解析：41.B【解析】Mary是第三人称单数，故助动词否定式用doesn't．

[单选题]38_______.

much

[单选题]44__________.

countries

[单选题]9． Miss Li is________ music teacher． We all like her very much．

our

解析：9．C  【解析】修饰名词要用形容词性物主代词。

[单选题]14．

and

解析：14．A【解析】考查and的用法。空格前“她是英国的”，空格后“她的英语很好”，是顺承关系，用连词and连接。

[单选题]A

Her name is Mary． She comes from America． She is in China with her father and mother． She can speak a little Chinese． She studies in No． 80 Middle School in Tianjin．She is in the same school as her parents(father and mother)． She is a good student． She goes to school six days a week． She likes getting up early． She doesn’t like to be late．She often goes to school very early． But today she gets up late． So she gets to the classroom at 7：30． But there aren’t any students in it． She is not late． She is still early． It’s Sunday today． The students are all at home． ( )21．Mary is from _______．

merica

解析：21.A【解析】根据原文“She comes frorh America．” 可知，她是美国人。