下列物质由离子构成的是
A.氯化钠
B.干冰
C.金刚石
D.铜
答案:A
题目分析:氯化钠是由钠离子和氯离子构成的;二氧化碳是由二氧化碳分子构成的;金刚石和铜均是由原子直接构成的物质。
同义句转换。
1. When I was a child, I made up my mind to be an artist.
________ a child, I _________ to be an artist.
2. He got a letter from his uncle last week. And the letter has more than 10000 words.
He ___________ ___________ his uncle last week. And the letter has __________10000 words.
3. Lucy wants to find a job in her free time.
Lucy is going to get a _________ job.
4. What's the weather like today?
__________ ____________ the weather today?
5. My computer doesn't work.
There is _________ ___________ ___________
第六届东亚运动会将于2013年10月6日至10月15日在天津举行。本届运动会吉祥物的表现形式借鉴了享誉中外的天津杨柳青木板年画的人物形象和艺术表现形式,具有浓郁的天津地域文化风格与特色。吉祥物的创作设计说明()。
A.艺术创作来源于创作者的聪明才智
B.人的主观能动性可以突破规律的约束
C.人的意识活动具有主动性和创造性
D.否定旧事物是创新的根本要求