问题 选择题

下列有关显微镜操作的叙述,错误的是

①标本染色较深,观察时应选用凹面反光镜和调大通光孔

②显微镜的放大倍数是指物像的面积或体积的放大倍数

③若转换高倍物镜观察时,需要先升高镜筒,以免镜头破坏标本

④显微镜下所成的像是倒立放大的虚像,若在视野中看到细胞质顺时针流动,则实际上细胞质就是顺时针流动的[ ]

A.①④

B.②③

C.①②③

D.①②③④

答案

答案:C

问答题
阅读理解

阅读理解

     More and more people are annoyed at the continually rising house prices.They want to know

who is to blame for it.Local governments, developers and speculators (投机商) share a vested (既

得的) interest in it.People who are really in need of homes are most likely to suffer heavy losses.

     Many local governments depend on selling land to keep its normal operation.The higher land

prices, the more money.Therefore, developers back the local governments by buying land at high

prices.In return, the governments make favorable policies to help the developers.For example, drive

all the possible home buyers to this nasty (危险的) market.They even encourage large numbers of

speculators to catch more people.

     Rising house prices have already become the fence which divides the Chinese society.It has

caused widespread dissatisfaction.The government will lose the support of the common people if

leaving house prices out of control.Besides, rising house prices will stop us building the new

countryside as the present policy actually forbid people to flow freely from cities to the countryside.

     Collecting taxes on houses can fundamentally solve this problem.On one hand, it will discourage

the speculators.On the other hand, it will offer a stable tax resource apart from reducing the sales

cost of the developers.Secondly, stop the developers selling the houses before completion.If so, the

developers will certainly try their best to sell all their houses once completed.And this will also lower

speculators' expectation of price rising, which will decrease speculations.

1. The only victims of rising house prices are________.

A. governments  

B. real home buyers

C. developers  

D. speculators

2. The local governments reward the developers by________.

A. offering enough land  

B. allowing sales in advance

C. providing enough buyers  

D. making favorable policies

3. We can infer from the passage that continually rising house prices will________.

A. benefit the government

B. draw more home buyers

C. help the housing industry develop soundly

D. affect the sound development of the Chinese society

4. Collecting taxes on houses has all the following effects except________.

A. making the developers do their best to sell their houses

B. cutting down speculations

C. supplying a stable tax resource for the government

D. decreasing the sales cost