一个长方形的长和宽都扩大到原来的4倍,长方形的面积就()。

题型:填空题

问题:

一个长方形的长和宽都扩大到原来的4倍,长方形的面积就(    )。

考点:长方形的面积
题型:填空题

过滤是分离液体和______的一种方法.

操作中的一贴:______;

二低:(1)______,(2)______;

三靠(1)______,

(2)______,

(3)______.

题型:填空题

下图所示是测定金鱼藻光合作用的装置。对一定时间内金鱼藻产生的气泡数没有影响的因素是

[ ]

A.金鱼藻数量

B.试管的体积

C.水中二氧化碳的含量

D.光源与金鱼藻间的距离

题型:填空题

阅读理解。

     I recently turned fifty, which is young for a tree, midlife for an elephant, and ancient for a sportsman.

Fifty is a nice number for the states in the US or for a national speed limit but it is not a number that I was

prepared to have hung on me. Fifty is supposed to be my father's age, but now I am stuck with this number

and everything it means.

     A few days ago, a friend tried to cheer me up by saying, " Fifty is what forty used to be." He had made

an inspirational point, Am I over the hill? People keep telling me that the hill has been moved, and I keep telling

them that he high-jump bar has dropped from the six feet I once easily cleared to the four feet that is

impossible for me now.

     " Your are not getting older, you are getting better." says Dr. Joyce Brothers. This, however, is the kind

of doctor who inspires a second opinion.

     And so. as I approach the day when I cannot even jump over the tennis net. I am moves to share some

thoughts on aging with you. I am moved to show how aging feels to me physically and mentally. Getting older.

of course, is obviously a better change than the one that brings you eulogies (悼词). In fact, a poet named

Robert Browning considered it the best change of all:

     Grow old along with me!

     The best is yet to me.

     Whether or not Browning was right, most of my first fifty years have been golden ones, so I will settle for

what is ahead being as good as what has gone by. I find myself moving toward what is ahead with a curious

blend  (混合) of both fighting and accepting my aging, hoping that the philosopher (哲学家) was right when

he said. " Old is always fifteen years from now."

1. The author seems to tell us in Paragraph 1 that _____.

A. time alone will tell

B. time goes by quickly

C. time will show what is right

D. time makes one forget the past

2. When the author turned fifty, people around him ______.

A. tried to comfort him

B. got inspiration with him

C. were friendlier with him

D. found him more talkative

3. The author considers his fifty years of life _____. 

A. peaceful

B. ordinary

C. satisfactory

D. regretful

4. We can infer from the passage that _____.

A. the old should led a simple life

B. the old should face the fact of aging

C. the old should take more exercise

D. the old should fill themselves with curiosity

题型:填空题

按下操纵台上的高速开关“分”按钮,即可进行落弓操作

题型:填空题

卵孢子(高等鞭毛菌亚门)

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