问题 选择题

下列实验操作错误的是(  )

 

答案

答案:A

题目分析:点燃酒精灯要用火柴,不可用燃着的酒精灯借火,防止引起失火;

检查气密性,先将导管伸入水中,再用手捂住试管外部;

倾倒液体时,试剂瓶口紧挨着试管口,标签对着手心,瓶塞倒放;

加热液体时,液体体积不超过试管容积的1/3,用酒精灯外焰均匀加热;

选A。

点评:实验操作中要遵守有关实验的要求,只有按照规范的实验操作做实验,才能保证实验的成功和安全。

阅读理解

阅读理解。

    Once upon a time there was a poor man. He had an orange tree in his garden. On the tree there were

many oranges. One day he found one of his oranges was much bigger than the others. It was as big as

a football. Nobody had seen such a big orange. The poor man took the orange to the King. The King was

so pleased that he gave the man a lot of money for it.

    When a rich man heard of it, he said to himself, "It's only an orange. Why did the King give so much

money for it? I'll take my gold cup to the King. He'll give me more money." 

    The next day when the King received the gold cup, he said to the rich man. "What a beautiful cup! I'll

show you something wonderful. Please take this great orange."

1. The poor man had an orange tree ______. [ ]

A. beside his garden

B. outside his garden

C. in front of his house

D. in his garden

2. The poor man was surprised to see ______ a football. [ ]

A. all the oranges on the tree were like

B. one of his oranges was as big as

C. what was on his tree was

D. some of his oranges were like

3. Why did the poor man take the biggest orange to the King? [ ]

A. Because the King had never seen such a big orange.

B. Because he could sell the orange to the King.

C. Because the King liked to eat the big orange.

D. Because he liked the King.

4. The rich man took his gold cup to the King. He thought ______. [ ]

A. the King would give him the biggest orange

B. the King would give him a new house

C. he could get much more money than the poor man

D. the King would give him lots of oranges

5. At last the King gave the rich man ______.[ ]

A. what he wished to get

B. a lot of money that he expected

C. the biggest orange

D. another gold cup

填空题