达尔文得出生物“个体间存在生存斗争”的推论的依据不包括  A.生物都有过度繁殖的

题型:选择题

问题:

达尔文得出生物“个体间存在生存斗争”的推论的依据不包括 

A.生物都有过度繁殖的倾向   

B.可供生物生存的资源是有限的

C.物种内的个体数量能保持稳定 

D.每种生物都要以另一种生物为食

考点:达尔文进化论的内容
题型:选择题

吸烟与肺癌关系的许多研究都是前瞻性队列研究,最初调查过吸烟情况的研究对象中有一部分后来失访了,关于这些失访者下列说法正确的是()

A.应从研究中剔除出去

B.只在随机化试验中才影响结果

C.其被随访到的那段时间应包括在观察人年中

D.只有当这些失访者具有较高的肺癌危险度时,才会得出有偏差的相对危险度的估计值

E.因为进入研究时存在选择偏倚,可得出不正确的相对危险度估计值

题型:选择题

Valencia is in the east part of Spain(西班牙). It has a port on the sea, two miles away on the coast. It is the capital of a province that is also named Valencia.

The city is a market centre for what is produced by the land around the city. Most of the city’s money is made from farming. It is also a busy business city, with ships, railways, clothes and machine factories.

Valencia has an old part with white buildings, colored roofs, and narrow streets. The modern part has long, wide streets and new buildings. Valencia is well known for its parks and gardens. It has many old churches and museums. The University in the centre of the city was built in the 13th century.

The city of Valencia has been known since the 2nd century. In the 8th century it was the capital of Spain. There is also an important city in Venezuela(委内瑞拉)named Valencia.

小题1:From the text, how many places have the name Valencia?

A.One.  

B.Two.

C.Three.     

D.Four.小题2:What is the main difference between the two parts of the city?

A.The color of the buildings.

B.The length of the streets. 

C.The age of the buildings.

D.The color of the roofs.小题3:When was Valencia the most important city in Spain?

A.2nd century.

B.8th century.

C.13th century.

D.20th century.小题4:What is Valencia famous for?

A.Its seaport.

B.Its University.

C.Its churches and museums.

D.Its parks and gardens.小题5:The main income of the city of Valencia is from its_____.

A.markets.

B.business.

C.factories.

D.farming.

题型:选择题

翻滚技术是一种自救技术()

题型:选择题

就全文而言,《哦,香雪》中写香雪在中学被同学再三盘问的情节所运用的叙述方式是()。

A.顺叙

B.倒叙

C.插叙

D.补叙

题型:选择题

下列程序的功能是用直接填入法将60H号类型中断服务程序INT 60H的入口地址填入中断向量表中,请填空: MOV AX,0 MOV EX,AX MOV BX,60H*4 _______________ MOV ES:WORD PTR [BX],AX _______________ MOV ES:WORD PTR [BX],AX ... INT 60H PROC ... IRET INT60H ENDP

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