问题 阅读理解

Dear Tom,

How are you? I’m in a new school in China this term. And I’m writing to you in my school now. This school is big and nice. There are more than two thousand students in my school. I like the teachers. They are all kind to me. And they can speak English well. So there is no problem to talk with them. My classmates are very friendly. They teach me Chinese and I teach them English.

We have many subjects at school. I like Chinese, music, PE and more. And my favorite subject is art. It’s really interesting. And my art teacher is very fun. He can draw well. I don’t like math. It’s too difficult. After school, I like playing basketball with my new friends. What a fun time to play with them!

We have no classes on weekends. I often go to movies with my parents. Sometimes I stay at home and watch TV. My parents want me to learn Chinese. Sometimes I go shopping. The food is so delicious in Chengdu. I like the food. And the people are very friendly. I love China. I love Chengdu.

Please write to me soon!

Yours                                      Jack

小题1:Jack writes this letter to __________.

A. pen pal            B. old friend          C. parents

小题2:Jack is in a ____________.

A. English school        B. Chinese school        C. small school

小题3:Jack’s teachers _____________.

A. teach him English     B. only teach him Chinese   C. are good to him

小题4:Jack help his new classmates with _________.

A. English          B. Chinese          C. music

小题5:Jack likes _________ after school.

A. playing basketball       B. swimming        C. going shopping

答案

小题1:B

小题1:B

小题1:C

小题1:A

小题1:A

小题1:细节题:从第一段的句子:How are you? I’m in a new school in China this term.可知是写给笔友的。选B

小题1:细节题:从第一段的句子:I’m in a new school in China this term.可知是在中国的学校。选B

小题1:细节题:从第一段的句子:They are all kind to me. 可知老师对他很友好。选C

小题1:细节题:从第一段的句子:They teach me Chinese and I teach them English.

可知是他教同学英语。选A

小题1:细节题:从第二段的句子:I like playing basketball with my new friends.可知他喜欢打篮球。选A

问答题

市场上出现了一种不添加防腐剂的绿色食品.某同学对其中的食品保鲜剂(在空气中放置一段时间)进行探究.

[查找资料]食物腐败是因为微生物在食物上生长,再加上充足的水和氧气,在适当的条件下就会迅速繁殖.但只要缺少一种条件,就可以防止食物腐败.常见的具有吸水性的物质有以下几种:①浓硫酸 ②生石灰 ③氢氧化钠 ④铁粉

[活动探究]

(1)初步探究:你认为①-④的物质中,不适合做食品干燥剂的是______理由是______.

(2)实验探究:

实验操作主要现象结论与解释
实验1.初步判断打开这种保鲜剂的包装袋,取少量样品于试管中,进行观察.该样品为白色固体.该保鲜剂一定不是

______.

实验2.对该保鲜剂的有效性进行探究向实验1的试管中加入适量的水,振荡.形成白色浑浊液体,试管壁发热.结论:该保鲜剂______

(填“有效”或“失效”)

实验3.对该保鲜剂的成分进行探究过滤实验2所得浑浊物,向滤液中通入二氧化碳气体.

将滤渣放入另一试管中,加入足量稀盐酸.

溶液变浑浊.

有气泡产生.

该保鲜剂中一定含有的物质是______,对于实验3不能确定的物质是______.
[活动反思]

(3)对于实验3不能确定的物质,某同学经过仔细研究,认为直接取原固体滴加酚酞溶液,通过观察颜色变化即可确定是否含有该物质,你认为这种方法是否合理?______,说明理由:______.

(4)铁粉也是很好的食品保鲜剂,因为______.

[拓展应用]

(5)根据食物腐败的条件分析,也可以充气包装的方法保鲜.请为充气包装的食品选择一种填充气体:______,理由是______.

单项选择题