问题 阅读理解

阅读理解。

Dear Tony,

     How are you? Are you still coming to my birthday party in July? My family, friends and my

classmates are all coming. The party is on Saturday July 2nd at around 6:30. It's at Uncle Bill's restaurant

in the city.First, we eat and talk from 6:30-7:45. After that we can go to a concert at 8:00. I hope you

can come. You can meet my other friends and sisters, too.

     Please write me soon.

                                                                                                                                Yours,

                                                                                                                                 Emily

1. What does Emily talk about in her letter?

A. Tony's birthday.

B. Her birthday.  

C. Uncle Bill's birthday.

2. Where are they going to have the party?

A. In Central Park.

B. Near the History Museum.  

C. At Uncle Bill's restaurant.

3. What can they do from 6:30 to 7:45? They can ______.

A. go to a concert

B. eat and drink

C. go to the museum

4. What time does the party start? It starts at about ______.

A. 6:30

B. 7:45

C. 8:00

5. Is there a free concert at 8:00 every Saturday night?

A. Yes, there is.

B. No, there isn't.  

C. Sorry, I don't know.

答案

1-5 BCBAC

实验题

化学兴趣小组的三位同学对蜡烛(主要成分是石蜡)及其燃烧进行了如下探究。

(1)贝贝取一支蜡烛,用小刀切下一小块,把它放入水中,蜡烛浮在水面上。结论:石蜡的密度比水___;

(2)芳芳点燃蜡烛,观察到火焰分为外焰、内焰、焰心三层。把一根火柴梗放在火焰中(如上图所示)约1s后取出,可以看到火柴梗的____(填“a”“b” 或“c”)处最先碳化。结论:蜡烛火焰的____温度最高;

(3)婷婷在探究蜡烛燃烧的过程中,发现罩在火焰上方的烧杯内壁被熏黑,你认为她的以下做法中不合适的是___________。

A.反复实验,并观察是否有相同现象

B.查找资料,了解石蜡的主要成分,探究生成的黑色固体是什么

C.认为与本次实验目的无关,不予理睬

D.询问老师或同学,讨论生成黑色物质的原因

(4)三位同学在探究的过程中,将短玻璃导管插入焰心,发现另一端也可以点燃。

【提出问题】导管里一定有可燃性气体,气体成分可能会是什么呢?

【猜想】贝贝认为:可能是蜡烛不完全燃烧时产生的CO。

芳芳认为:可能是蜡烛受热后产生的石蜡蒸气。

婷婷认为:可能以上两种情况都有。

【实验方案】换一根较长的导管,并用冷的湿毛巾包住导管,然后在导管另一端做点火实验。

【现象与结论】如果观察到______________________________现象,则贝贝的猜想正确;

如果观察到_________________________________现象,则芳芳的猜想正确;

如果观察到_____________________________________现象,则婷婷的猜想正确。

选择题