如图是茎的横切面和纵切面示意图,请据图回答 (1)图中①是______,它在__

题型:解答题

问题:

如图是茎的横切面和纵切面示意图,请据图回答

(1)图中①是______,它在______中;②是______,该结构属于______组织;③是______,它在______中;

(2)图中④表示______和______在导管中的运输,运输方向是______.

考点:根的生长
题型:解答题

下列哪些是属于有源设备?()

A.光纤直放站近端

B.微蜂窝

C.无线直放站

D.功率分配器

题型:解答题

阅读理解

     Every object tells a story. Even the most ordinary objects can present to us powerful images.

Sometimes it is the ordinary nature of these objects that actually makes them so extraordinary.

Such is the case with an old leather shoe in a museum in Alaska. At first glance it does not look like

much. It is a woman's shoe of a style popular in the 1890s. But what is unique(独特的) about this

shoe is where it was found. It was discovered on the Checkout Pass, the famous trail used by the

people seeking gold in Alaska. Who it belonged to or why it was left there is not known. Was it

perhaps dropped by accident as the woman climbed up the 1500 stairs carved outface? Or did she

throw away goods that she didn't need in order to travel lighter?

     Over 100, 000 people with "gold fever" made this trip hoping to become millionaires. Few of

them understood that on their way they would have to cross a harsh wildness. Unprepared for such

a dangerous journey, many died of starvation and exposure to the cold weather.

     The Canadian government finally started requiring the gold seekers to bring one ton of supplies

with them. This was thought to be enough for a person to survive for one year. They would carry

their supplies in backpacks(背包) each weighing up to fifty pounds; it usually took at least 40 trips

to get everything to the top and over the pass. Whoever dropped the shoe must have been a brave

and determined woman. Perhaps she was successful and made it to Alaska. Perhaps she had to turn

back in defeat. No one will ever know for sure, but what we do know is that she took part in one of

the greatest adventures in the 19th century.

1. Which of the following is right?

A. it was found on a famous trail          

B. it was an important clue to life in the past

C. it at one time belonged to a VIP

D. it was a fashionable shoe at that time

2. According to this passage, many people who went to Alaska _______.  

A. eventually became millionaires

B. were not properly equipped

C. were very poor                 

D. brought with them many shoes

3. The Canadian government made gold seekers bring one year's supplies with them so that ___.

A. they would not die of hunger and cold

B. the army would have enough food for fighting a war

C. they would change these goods with the Eskimos

D. the supplies would make Alaska rich

4. No matter what happened to the woman who owned the shoe, _______. 

 

A. she must have been a brave woman.    

B. she certainly dropped the shoe on purpose

C. her adventurous spirit is definitely admired  

D. her other shoes were equally fashionable

 

5. what's the best title of the passage?

A. special shoe whose ower is a woman.      

B. the sad story about the shoe.

C. the old shoe that has a special. story.        

D. gold seekers

题型:解答题

一位同学用刻度尺先后三次测量一物体长度,各次测量结果分别是25.43cm、25.45cm、25.46cm,则此物长应是

A.25.44cm

B.25.45cm

C.25.446cm

D.25.447cm

题型:解答题

下列关于C、Si、S、Cl四种非金属元素的说法中,正确的是(  )

A.两两结合形成的化合物都是共价化合物

B.在自然界中都能以游离态存在

C.氢化物的热稳定性比较:CH4<SiH4<H2S<HCl

D.最高价氧化物都能与水反应生成相应的酸,且酸性依次增强

题型:解答题

课程的改革不仅是内容的改革,也是()和()的改革。

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