建立生态农业时巧设、增设食物链的目的不包括() A.实现物质和能量的分层多级利用 B

题型:单项选择题

问题:

建立生态农业时巧设、增设食物链的目的不包括()

A.实现物质和能量的分层多级利用

B.减轻环境污染、提高抵抗力稳定性

C.加强生物防治,控制有害生物的危害

D.食物链延长,消耗能量环节增多,系统总能量利用率降低

考点:高中生物生态系统的结构和功能生态系统的结构和功能题库
题型:单项选择题

Does this situation seem familiar to you?Your English is progressing well,the grammar is now familiar,the reading comprehension is no problem,and you are speaking quite fluently.____1__

First of all,remember that you are not alone. Listening is probably the most difficult job for almost all learners of English as a foreign language.

The most important thing is to listen as often as possible.___2____

The Internet is really a useful tool for English students. You can download The RealPlayer from RealMedia.com. The RealPlayer allows you to use the Internet like a radio station.

Once you have begun to listen on a regular basis,you might still be frustrated by limited understanding._____3____

Here is some of the advice I give my students:

•Accept the fact that you are not going to understand everything.

•Stay relaxed when you do not understand,and try listening to the material for more times.

•Do not translate everything into your native language.

•_____4_____Don’t concentrate on details before you have understood the main ideas.

•Listen to something you enjoy.

I remember the problems I had in understanding spoken German when I first went to Germany. In the beginning,when I didn’t understand a word,I insisted on translating it in my mind. This method usually resulted in confusion._____5_____Firstly,translating creates a barrier between the listener and the speaker. Secondly,most people repeat themselves constantly. By remaining calm,I noticed that even if I didn’t pay much attention I could usually understand what the speaker had said.

A.But you can’t follow a native English speaker at all!

B.What should you do?

C.But listening is a problem for most of the beginners!

D.However,after several weeks,I got used to the new environment in Germany.E.So,what you need to do is to find listening resources.

F.Then,after the first six months,I discovered two extremely important facts.

G.Listen for the general idea of the conversation.

题型:单项选择题

英国资产阶级革命后,国教派和非国教派都大力创办学校,这类学校统称为__________。

题型:单项选择题

下列物质中,所含的原子或离子中最外层都为8电子结构的是(  )

A.HCl

B.Na2S

C.LiCl

D.H2O

题型:单项选择题

定量分析是通过数学模型计算分析最优的配送位置,配送中心的选址会因为选址范围和选址数量不同,计算的数学模型也不同。

题型:单项选择题

影响材料计划的实现的因素主要有()。

A.施工任务的改变

B.设计变更

C.采购情况改变

D.施工进度变化

E.业主要求

更多题库