问题 填空题

联合国气候变化框架公约《京都议定书》要求发达国家限制二氧化碳等温室气体排量,以控制日趋严重的温室效应.

(1)绿色植物通过______作用吸收CO2,呼吸作用产生的______释放到大气中.

(2)科学家采取“组合转化”技术,将CO2和H2以一定比例混合,在一定条件下反应(反应的化学方程式如下),生成一种重要的化工原料和水.在括号中填写该化工原料的化学式:

2CO2+6H2═1______+4H2O

(3)为了减缓大气中CO2含量的增加,以下建议可行的是(填序号)______.

①开发太阳能、水能、风能、地热等新能源;

②禁止使用煤、石油、天然气等矿物燃料;

③大量植树造林,禁止乱砍滥伐.

答案

(1)光合作用是指植物通过叶绿素,利用光能把二氧化碳和水合成葡萄糖和氧气,同时释放能量的过程.

(2)根据质量守恒定律,化学反应前后原子的种类和数目不变,一个未知分子中含两个碳原子和两个氢原子,化学式为C2H4

(3)①开发太阳能、水能、风能、地热等新能源,能减少化石能源的使用,从而减少了二氧化碳的排放,所以正确;

②目前的能源结构中,是以化石燃烧为主的,禁止使用煤、石油、天然气等矿物燃料根本不现实,所以错误;

③植物的光合作用吸收二氧化碳,释放氧气,大量植树造林,禁止乱砍滥伐能加强植物光合作用,吸收大气中的二氧化碳,所以正确.

故答案为:

(1)光合;CO2(或二氧化碳)

(2)C2H4

(3)①③.

阅读理解

阅读理解。

     Dragon Boat Festival is a funny Chinese holiday. Usually, it's around June or July. Both children and adults

like this holiday.

     First, there are dragon boat races. Dragon boats are very long. They are painted in bright colours. In each

boat, there are many people rowing. There's also somebody beating a drum (击鼓). The winners of the races

can get a lot of money.

     During Dragon Boat Festival, people also eat a special kind of rice dumplings. To make one of these rice

dumplings, people prepare meat, vegetables and other things. Then they can make different flavors of

dumplings. Some are sweet, and some are salty (咸的). They all taste good. People give them to friends.

     On the evening of the holiday, families have a big meal together. Dragon Boat Festival is a great time for

everybody.

1. When is Dragon Boat Festival? 

A. Every June fifth.

B. Twice a year.

C. It's around June or July.

D. In winter.

2. How do Chinese people celebrate the festival?

A. Eating mooncakes.

B. Eating rice dumplings.

C. Holding dragon boat races.

D. Both B and C.

3. Which of the following about dragon boats is TRUE?

A. They are very long.

B. They have many flowers.

C. They are full of flags.

D. Babies often row them.

4. The meaning of the word "flavors" in Chinese is _________.

A. 风情

B. 情趣

C. 味道

D. 特点

5. Which is NOT the way (方式) to celebrate Dragon Boat Festival?

A. Having a big meal together.

B. Eating jiaozi and wonton (馄饨).

C. In memory of (纪念) Qu Yuan.

D. Holding dragon boat races.

单项选择题