下列气体中,有毒的是 A.N2 B.O2 C.CO D.CO2

题型:选择题

问题:

下列气体中,有毒的是  

A.N2

B.O2

C.CO

D.CO2

考点:二氧化碳的制取和收集安全措施和生活经验自然界中的碳循环一氧化碳的毒性
题型:选择题

嫁接约()后,在撤除遮阴物的同时,揭开接口的缠绑物等。

A.1月

B.2个月

C.3个月

D.4个月

题型:选择题
QQ空间是一个展示自我和沟通交流的网络平台.它既是网络日记本,又可以上传图片、视频等.QQ空间等级是用户资料和身份的象征,按照空间积分划分不同的等级.当用户在10级以上,每个等级与对应的积分有一定的关系.现在知道第10级的积分是90,第11级的积分是160,第12级的积分是250,第13级的积分是360,第14级的积分是490…若某用户的空间积分达到1000,则他的等级是(   )
A.18B.17C.16D.15
题型:选择题

下列叙述中哪项与奋乃静不符

A.化学名为4-[3-(2-氯吩噻嗪-10-基)丙基)-1-哌嗪乙醇
B.易氧化,逐渐变色,可能是生成不同的醌或结构而显色
C.结构中含吩噻嗪环及哌嗪环
D.与吡啶硫酸铜溶液作用,生成紫色
E.为中枢抑制剂,用于慢性精神分裂症、躁狂症、焦虑症等,也有镇吐作用

题型:选择题

We all love our children and we all know how competitive the world is these days. What’s it going to be like when our children leave school? Will they have the skills they need to stay ahead of the competition?

All children need two basic skills to succeed. They must be able to read and they must be able to write. And with so much information available to them these days, they must be able to read quickly and accurately. That’s why your children need to be able to speed-read.

It’s ironic (讽刺的) that at this time of space-age technology, we’ve gone back to one of the earliest forms of mass communication—the written word. The Internet has introduced a revival (重新流行) of writing, and if you can’t keep up, you’ll be left behind. You certainly don’t want your children to be left behind.

You can help to make sure that your children are excellent writers—you can help them to learn how to use their language. Better still, you can learn with them!

You and your children can spend time together in a worthwhile pursuit (事业)—learning how to write. Forget the theme parks, the computer games, the expensive movies and interesting sports. If you want your children to have treasured memories of time spent with you, learn together.

For less than you would pay for tickets to a theme park, you can invest in your children’s future—help them learn to write well with my six-part writing course.

Don’t stand by while your child is left further and further behind.   

小题1:From the last two paragraphs, we can know the main purpose of the passage is_______

A.To encourage students to be better prepared for the future.

B.To list the qualities children must have for their future success.

C.To persuade parents to choose a writing course for their kids.

D.To explain the difficult situation children have to face at present.小题2:In the author’s opinion, ______.

A.speed-reading is the first step in a child’s formal education

B.children today waste too much time on games, movies and sports

C.children’s success depends much on good skills in reading and writing

D.writing helps people communicate more effectively in modern society小题3:What does the author think of writing as a form of communication now?

A.Important.

B.Funny.

C.Informal.

D.Old-fashioned.小题4:What’s the advantage of children’s learning together with their parents?

A.They will learn more quickly and accurately.

B.They will not be affected by games and sports.

C.It will encourage them to work for a higher pursuit.

D.They will have good memories of time spent with parents.

题型:选择题

卷轴绷带包扎时,下列哪些部位可用环行包扎()

A.包扎起始和结束时

B.单眼或单耳包扎

C.肩部包扎法

D.头皮包扎

E.残肢端包扎

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