问题 填空题

海洋植物如海带海藻中含有丰富的碘元素,碘元素以碘离子的形式存在。实 验室里从海藻中提取碘的流程如下:

(1)指出提取过程中有关实验操作的名称:①         ;③        

(2)操作③用到的主要玻璃仪器                   

(3)提取碘的过程中,可供选择的有机溶剂是(填选项字母)__________。

A.水、酒精

B.四氯化碳、苯

C.汽油、醋酸

D.汽油、酒精(4)写出②的离子方程式:                          

(5)能选用汽油从碘水中提取碘的原因是_______________  

答案

(1)过滤 ;萃取 (各1分)(2)分液漏斗 (1分)

(3)B (1分)      (4)  Cl2 + 2 I ="=" I2 + 2 Cl (2分)

(5)汽油与水不互溶碘在汽油中的溶解度大于在水中的溶解度 (2分)

题目分析:(1)属于常见的物质分离的操作,(2)萃取需要分液漏斗,(3)有机溶剂与水不能互溶,(4)属于氯气把碘离子氧化为碘离子,(5)符合萃取剂的要求,不能与水互溶,且溶解度要比在水中大。

点评:本题是常见的关于海带中碘元素的提取的实验,主要涉及到了一个反应,氯气制取碘单质,一个实验操作:萃取。本题也联系到了萃取剂的选择要求。这个基本知识需要学生理解性记忆。

阅读理解

It’s not just adults who have a thing or two to discuss with other people, babies too have their own social lives and enjoy group interaction, according to a world-first study.

The breakthrough study conducted by psychologist Professor Ben Bradley, at Charles Sturt University, could completely transform the way child-care centres are set up. In their study, the researchers examined groups of nine-month-old babies in new South Wales and Britain.

And they came across astounding (令人吃惊的) results – it was found that infants had “social brains” and focused not just on their mothers but on social life in groups as well.

“They communicate with more than one baby at once, and show jealousy and generousness,” said Professor Bradley.

He added, “They develop their own meanings through group interaction, they notice if a group member is behaving differently and they take on roles, such as leaders and followers.”

“A baby who has a depressed mother tends to be withdrawn (内向的), but put that same baby in a group of its peers (同龄人)and they behave and interact like any other baby.”

It was the first all-baby group study ever to be conducted. “Most studies of babies concentrate on the infant-mother relationship, assuming that is the single foundation for mental health, but babies are constantly involved with groups of people other than their mothers: fathers, siblings, grandparents and those taking care. Therefore, the ‘mother-baby approach’ needs to be combined with a ‘group approach’,” said Bradley.

Phoebe Christison, a child-care worker at Camperdown Sunshine Bubs in Sydney’s inner west, said she often noticed what appeared to be emotional attachments developed between toddlers.

She said, “Joel (10 months) and Isabella (11 months) always like to hold hands when they sit in their high chairs and eat. And babies definitely show jealousy. They push and touch each other, and copy what the other is doing.”

46. Which of the following statements about the study is TRUE?

A. It’s the first study to look at all-baby groups.

B. It divides babies according to their personalities.

C. Its aim is to change the way of child care.

D. Its results are unbelievable.

47. A baby who has a depressed mother _________.

A. tends to be a follower                       B. also enjoys group interaction

C. has poor social ability                       D. pays more attention to its mother

48. What can be inferred from the result of this study?

A. Babies are affected by groups more than by their mothers.

B. There’s no need of child-care centers at all.

C. Adults should include babies when having social activities.

D. The normal infant-mother bond alone isn’t enough for the good mental health for babies.

49. The underlined word “toddlers” in Para. 8 can be replaced by “_________”.

A. adults    B. infants     C. peers     D. groups

50. The example given in the last paragraph proves that a baby ________.

A. is born to be friendly to other babies

B. has interest in peers as well as in its mother

C. may have emotional attachments to another baby

D. shows jealousy and generousness as an adult

多项选择题