在下列蛔虫形态结构中,哪项是比水螅在进化上的高等之处() A.虫体细长 B.具有

题型:选择题

问题:

在下列蛔虫形态结构中,哪项是比水螅在进化上的高等之处(   )

A.虫体细长

B.具有消化腔

C.四周围有三片唇

D.具有口和肛门

考点:生物分类的概念和依据
题型:选择题

— Is this room   _____  ?   

—Yes, it’s theirs.

A.Julie and Becky

B.Julie’s and Becky’s

C.Julie’s and Becky

D.Julie and Becky’s

题型:选择题

短文改错(共10小题;每小题1分,满分10分)

假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文中共有10处语言错误,每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏字符号(/\),并在其下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下划一横线,并在该词下面写出修改后的词。

注意:1.每处错误及其修改均仅限一词;  

2.只允许修改10处,多者(从第十一处起)不计分。

Nowadays women are playing a much more important part in society. More and more women are working like teachers, scientists and even leader. Almost all jobs that were used to be done by men are done perfectly well by women. Women are no longer looking down upon in society. With the changes in their social role, women’s position in the family have been improved as well. It’s hard to see the phenomenon which the wife is busy while the husband is sitting in an armchair, watching TV. In spite of all these changes, the great number of men still guard his rights. They thought of women as incapable creatures. Sometimes few women are allowed attend important meetings. This is the problem we should try to solve now.

题型:选择题

下列有关遗传密码的叙述哪项不正确()。

A.在mRNA信息区,由5’→3’端每相邻的三个核苷酸组成的三联体称为遗传密码

B.在mRNA信息区,由3’→5’端每相邻的三个核苷酸组成的三联体称为遗传密码

C.生物体细胞内存在64个遗传密码

D.起始密码是AUG遗传密码

E.终止密码为UAA、UAG和UGA

题型:选择题

小丽在剧场欣赏舞蹈时,发现舞台上有“白雾”缭绕的情景,始终不明白这是怎么回事,以下解释中正确的答案是(  )

A.干冰(固态二氧化碳)液化而成的小水滴

B.干冰迅速熔化再蒸发的气体

C.干冰迅速升华,使空气中的水蒸气液化形成的水珠及小水珠凝固成的小冰晶

D.干冰迅速升华变成的气体

题型:选择题

救护队员不应超过()岁。

A.50

B.48

C.46

D.45

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