问题 选择题

用一块废旧的铁丝石棉网,将铁丝望剪成几小片,用稀盐酸除去铁锈,放入锥形瓶中.如图,再向锥形瓶中加入3~4mL饱和食盐水润湿铁丝,塞紧带导管的单孔塞,导管的一端伸入红色的水中,一段时间后,可观察到的现象是(  )

A.铁丝片生锈

B.红水上升到玻璃管中

C.铁丝片消失且红水上升到玻璃管中

D.铁丝片生锈且红水上升到玻璃管中

答案

铁生锈的条件是铁与水和氧气同时接触.锥形瓶中的铁与氧气和水同时接触,容易生锈,生锈时消耗了锥形瓶中的氧气,气压减小,在外界大气压的作用下水在导管中形成一段液柱.

故选D.

阅读理解

阅读理解。

                                                             For Children

Museum: Children's Museum, Sundays, 89 North Street, 67641235

Story time: Children's Library, 106 Green Street, Wednesdays during 9:30 a.m -5:00p.m. 66599624

Sports: Football Club, Tuesdays and Thursdays, 16 Yangtze Road, 96725643

            Basketball Club, Wednesdays and Fridays, 79071632

Cinema: New films for children, 99 Brick Road, 69001354

Useful Phone Numbers

Fast Food Restaurant: 66387901

Hospital: 68787451

Visitor Information Center: 800-120-9847

Taxi: 79210583

Visitor Hotel(宾馆) Information: 800-739-7302

1. It's Friday afternoon, you can go to______ .

A. visit the museum          

B. play football

C. play basketball            

D. read children's stories

2. If children want to watch new films, they should go to______.

A. 16 Yangtze Road          

B. 89 North Main Street

C. 106 Green Street          

D. 99 Brick Road

3. If you dial (拨号)66387901, you can ______.

A. ask for some hotel information    

B. do some shopping

C. have a good story time            

D. get fast food in a restaurant

4. Lily's father is ill, She should dial______.

A. 800-120-9847    

B. 79210583      

C. 68787451  

D. 96725643

5. You can not get any information about______from the two notices.

A. looking for a hotel      

B. doing eye exercises

C. eating fast food        

D. taking a taxi

单项选择题