问题 选择题

某同学设计的下列各实验方案中,你认为不能达到实验目的是(  )

A.用燃着的木条鉴别二氧化碳和氧气

B.加入适量的澄清的石灰水除去CaCl2溶液中的HCl

C.用浓硫酸除去氢气中混有的水蒸气

D.用石蕊试液鉴别澄清的石灰水和氢氧化钠溶液

答案

答案:D

阅读理解

阅读短文,选择正确答案。

     Some members of an International Voluntary Organization (国际志愿组织) arrived at a small village of an

African country. 

     The villagers lived in small houses, which were built with wood and leaves. There was no school or hospital.

The villagers didn't know how to grow crops. They only went to kill some wild animals and pick some fruits in

the mountains as their food. The volunteers (志愿者) came here to help the village kids. They brought with them

many textbooks and some medicine. They taught the kids how to play volleyball and also tried to learn their

language so that they could talk with the kids better. 

     Because of their hard work, the International Voluntary Organization gave the villagers the money to carry

electricity to the village. When the lights in every house were shining, the villagers were very excited. They called

them "the little suns". Then, they held a party to choose some lucky men who would invite the volunteers to go

to their homes to see the beautiful night together with their families.

1. The volunteers came to the small village ________. [ ]

A. for fun

B. to help the villagers

C. for a trip

D. to do some experiments

2. How did the villagers get their food? [ ]

A. They grew crops.

B. Someone sent them the food.

C. They got it from the river.

D. They looked for it in the mountains by themselves.

3. The volunteers tried to learn their language because ________. [ ]

A. it was great fun

B. they thought it was interesting

C. they wanted to talk with the kids better

D. they wanted to learn this kind of language

4. Before the volunteers came to the village, there was ________. [ ]

A. no electricity in the village

B. only a school in the village

C. no food for the village

D. a hospital in the village

5. The lucky men could ________. [ ]

A. turn on the lights first

B. carry electricity to the village

C. be offered some money to carry electricity

D. have a chance to invite the visitors to go to their homes

选择题