玻璃管液位计的玻璃管长度一般在（）mm之间，工作压力不超过1MPа。A.200～10

一根长2米的长方体木块，横截面是边长为2厘米的正方形，把它平均截成3段（垂直于长截面），表面积增加了（    ）。

下列抗生素中最容易导致再生障碍性贫血的是（）

A.氧氟沙星

B.红霉素

C.亚胺培南／西司他丁钠（泰能）

D.头孢他啶

E.氯霉素

玉米是我国重要的粮食作物之一，玉米幼苗有的是绿色的正常苗，有的是叶片发白的白化苗。白化苗由于缺乏叶绿素而不能进行光合作用，会过早死亡。请分析回答下列问题：

（1）玉米被称为“黄金作物”，富含淀粉、脂肪、胡萝卜等营养物质，这些营养物质储存于玉米种子的___________中。在玉米种子形成的过程中，必须经历_________和_________两个重要生理过程。

（2）玉米幼苗能产生叶绿素与不产生叶绿素在遗传学上称为________________。

（3）玉米的白化苗是不利变异，引起这种变异的原因是____________________的改变。

（4）玉米能产生叶绿素是由于它拥有显性基因B，而是隐性基因b则令玉米丧失产生叶绿素的能力。则白化苗的基因组成是__________。

（5）科研人员将两株玉米杂交后，再收集种子种植。在935粒成功萌芽的种子中，有705粒发育成绿色幼苗，余下的幼苗为白化苗。请写出这些绿色幼苗的基因组成______________。

阅读理解

     Young adult filmmakers all hope to show their works in international festivals like Sundance and

Toronto. But what about really young filmmakers who aren't in film school yet and aren't.strictly 

 speaking. even adults ?

     They are at the heart of Wingspan Arts Kids Film Festival. tomorrow. in a setting any director

might envy: Lincoln Center.Complete with  "red carpet" interviews and various  awards. thefestival

has much in common with events for more experienced moviemakers. except for the age of the

participants:about 8 t0 18.

     " What's really exciting is that it's film for kids by kids. " said Cori Gardner, managing director of

Wingspan Arts, a nonprofit organization offering youth arts programs in the New York area. This year

the festival will include films not only from Wingspan but also from other city organizations and one

from a middle school in Arlington,Virginia. " We want to make this a national event." Ms Gardner

added.

     The nine shorts to be shown range from a Claymation biography of B. B. King to a science fiction

adventure set in the year 3005. "A lot of the material is really mature. " Ms  Gardner said, talking about

films by the New York City branch of Global Action Project,a media arts and leadership-training

group. " The Choice is about the history of a family and Master Anti-Smoker is about the dangers of

secondhand smoke. " Dream of the Invisibles describes young immigrants'(移民) feelings of both

belonging and not belonging in their adopted country.

     The festival will end with an open reception at which other films will be shown. These include a music

video and a full-length film whose title is Pressures.

1. Wingspan Arts Kids Film Festival___________.    

A. is organized by a middle school

B. is as famous as the Toronto Festival

C. shows films made by children

D. offers awards to film school students

2. Which of the following is true of Wingspan Arts?   

A. It helps young filmmakers to make money.

B. It provides arts projects for young people.

C. It's a media arts and leadership-training group.

D. It's a national organization for young people.

3. The underlined word "shorts"in Paragraph 4 refers to_________.  

A. short trousers                  

B. short kids

C. short films                      

D. short stories

4. Movies to be shown in the festival_________.

A. cover different subjects   

B. focus on kids' life

C. are produced by Global Action Project

D. are directed by Ms Gardner