下列四组生物中,都属于真核生物的一组是() A.噬菌体和根霉 B.细菌和草履虫 C.

题型:单项选择题

问题:

下列四组生物中,都属于真核生物的一组是()

A.噬菌体和根霉

B.细菌和草履虫

C.蓝藻和酵母菌

D.衣藻和变形虫

考点:高中生物细胞的结构与功能细胞的结构与功能题库
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—Why does Mary look so worried today?

—I’m not sure, but she _____ a small accident driving here.

A.must have

B.might have

C.must have had

D.might have had

题型:单项选择题

阅读理解。

     Australian Flag Designs by Readers of the Sun-Herald

     We received dozens of responses after inviting readers to send in their designs for a new flag. The designs we received include:

     James Anthony, Drummoyne

     James reduces the Union Jack down in size and changes its shape to become a reminder of the British tradition rather than canceling it altogether. At the same time he suggests enlarging the stars of the Southern Cross. His design attempts to use the best of both worlds in a newly designed flag.

As he says, "the British part of the Australian Flag is too big and the Australian bits are too small. When you make the stars bigger the Australian flag can look impressive."

     Joe Bollen, Turranmurra

     Joe's flag has the main elements of a risen sun, white horizon(地平线), red earth at the base and the Southern Cross. He intends to make the risen sun a special Australian symbol on the flag. He believes it represents life. The Southern Cross shows that we live in the Southern Hemisphere. (半球)

     Maria Ieraci, Sydney

     Maria deleted the Union Jack but otherwise kept the flag as is with the Southern Cross and Federation Star. She says, 'There is only one correct way to change the Australian flag" and that is "to drop the Union Jack-when Australia becomes a Republic", which she hopes will be before 2010.

     Ron Bennett, Sydney

     Ron recommends using the Aboriginal colors but replacing their image of the sun with the map of Australia. He says, "Australia is unique being an island continent with an instantly recognizable outline at that" and "this will leave no doubt as to which country the flag belongs."

1. Which of the four designs can remind you of the past of the country?

A. Joe's  

B. Maria's  

C. Ron's  

D. Jame's

2. The Southern Cross in some of the designs represents _________.

A. the spirit of the nation  

B. the position of the country  

C. the tradition of Britain  

D. the expectations of the people

3. What does the Union Jack refer to?

A.the British flag    

B. A former British ruler  

C. group of stars      

D. A former symbol of Australia

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女性,50岁,临床诊断为缺铁性贫血,服亚铁盐类药物感觉胃不适,在营养咨询时

医生所介绍含铁丰富的食物,应除外()

A.动物肝脏

B.动物血

C.牛奶

D.肉类

E.鱼类

题型:单项选择题

一般居民住宅、办公场所,若以防止触电为主要目的时,应选用漏电动作电流为()毫安的漏电保护器。

题型:单项选择题

客运专线预制梁施工中,为加快制梁台座周转速度,()之后可移出制梁台座。

A、预张拉

B、初张拉

C、终张拉

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