摘要： 试验
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翻译官:试试看。
1 考试及格__________2 中学___________ 3 小学_________
4 缺席_________ 5.作演讲______________6 课间休息________
7 一次家长会________8 运动节_______9 课外活动_________
10 参加考试________11 科学实验室______12 语言社团________
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4 缺席_________ 5.作演讲______________6 课间休息________
7 一次家长会________8 运动节_______9 课外活动_________
10 参加考试________11 科学实验室______12 语言社团________
(2006·重庆市课改试验区)
The price of this computer is the ________ of the three.
[ ]
A．smallest
B．biggest
C．highest
D．tallest
（12分）在除杂质的实验操作中，为了将溶液中的杂质完全去除，通常需加入过量的除杂质试剂。某校化学课外活动小组为了除去粗盐中含有少量Na2SO4、MgCl2，设计了下列实验步骤：
试简要说明：
（1）加入过量BaCl2的溶液的原因_______ 。
（2）判断BaCl2已过量的方法是
（3）加入过量Na2CO3的溶液的原因______ ___ _ _。
（4）滴加稀盐酸直至pH=7的目的是____ ___ __；
写出这时反应的化学方程式 查看习题详情和答案>>
试简要说明：
（1）加入过量BaCl2的溶液的原因_______ 。
（2）判断BaCl2已过量的方法是
（3）加入过量Na2CO3的溶液的原因______ ___ _ _。
（4）滴加稀盐酸直至pH=7的目的是____ ___ __；
写出这时反应的化学方程式 查看习题详情和答案>>
重点词汇.
1. visit _____ 2. 考试; 测验 _____
3. stay _____ 4. 练习; 实践 _____
5. past _____ 6. 山; 山脉 _____
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3. stay _____ 4. 练习; 实践 _____
5. past _____ 6. 山; 山脉 _____
阅读理解。
Mr Smith made many tests (作试验) with different animals and the monkey was the cleverest of all
the animals.
One day Mr Smith put a monkey in a room. He also put some small boxes in it. In one of the boxes
th
ere was some food. "How long will it take the monkey to find the food?" Mr. Smith said to himself.
"Let me wait and see." He left the room and waited outside. Three minutes later, he put his eye to the
keyhole (钥匙眼). What did he see? He saw the eye of the monkey. The monkey was on the other side
of the door and looked at Mr Smith through the keyhole.
the animals.
One day Mr Smith put a monkey in a room. He also put some small boxes in it. In one of the boxes
th
ere was some food. "How long will it take the monkey to find the food?" Mr. Smith said to himself. "Let me wait and see." He left the room and waited outside. Three minutes later, he put his eye to the
keyhole (钥匙眼). What did he see? He saw the eye of the monkey. The monkey was on the other side
of the door and looked at Mr Smith through the keyhole.
1. Mr Smith made tests with _____.
A. different animals
B. the monkey only
C. all the monkeys
D. all of the cleverest animals
B. the monkey only
C. all the monkeys
D. all of the cleverest animals
2. There was some food in _____ of the small boxes.
A. some
B. none
C. one
D. each
B. none
C. one
D. each
3. Mr Smith put a monkey and some boxes in a room because he wanted to know_____.
A. how much food monkey could find
B. how many boxes the monkey could carry
C. how long it would take the monkey to put its eye to the keyhole
D. how long it would take the monkey to find the food
B. how many boxes the monkey could carry
C. how long it would take the monkey to put its eye to the keyhole
D. how long it would take the monkey to find the food
4. What was the monkey doing when Mr Smith was putting his eye to the keyhole?
A. The monkey was eating food.
B. The monkey was looking for food.
C. The monkey was eating on the other side of the door.
D. The monkey was looking at Mr Smith through the keyhole.
B. The monkey was looking for food.
C. The monkey was eating on the other side of the door.
D. The monkey was looking at Mr Smith through the keyhole.
5. Mr Smith is a _____.
A. teacher
B. scientist (科学家)
C. doctor
D. farm worker
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B. scientist (科学家)
C. doctor
D. farm worker