our environments is in trouble.modern ways of living and today's industries are polluting it. Most people think there is nothing they can do. This is not true. Everyone can do something to help save our environment. Here is a list of things you can do.

-Help to cut pollution by taking the bus to work instead of your car.

- Buy fruit and vegetables that have not been treated with pesticides.

- Take all your cans, bottles, paper to the recycling center near your house

* T or F

a) The environment is polluted by today industries

b) It is true that there is nothing for people to help protect the environment

c) You should buy friut which has not been treated with pesticsides

d) Using public bus helps to reduce pollution 

The environment is everything around us, both natural and made by man. A major problem in the world today is the destruction of the natural environment.

This is a complicated problem. We burn fuel, and this causes air pollution. We throw away lastic bags, containing toys and other objects. These stay in the environment, they are not like paper or wood that slowly disappear. We have made thousands of new chemicals. Factories that make or use chemicals always have chemical wastes. These are often poisonous, and they also stay in the environment.

Since 1945 several countries have been testing nuclear bombs in the air and underground. The explosions in the air cause nuclear fallout. The fallout causes cancer and kills animals and people. Nuclear power plants that make electricity also produce dangerous wastes and have accidents that can be very disastrous.

* Choose the correct answer

3. The nuclear fallout causes 

A. smoke from vehicles

B. Burning fuel, plastic bags and wastes from factories

C. A and B

if he......... you he would do this work

a) is            b) were             c) had                  d) be

Đọc đoạn văn sau rồi làm các yêu cầu bên dưới

Are you looking (1)………………………a cheap, clean, effective source of power that doesn’t (2)…………………………pollution or waste natural resource? Look no further than solar energy. While most fuels now in use are (3)………………………burned at a big rate, solar energy, a power from the (4)………………………, will last as long as the world (5)……………………….This energy has been (6)……………………..to heat and cool homes or to cook food. It has been used (7)…………………… radio batteries and provided power for telephone lines. The devices, (8)…………………….., are cheap to operate but very expensive to produce.

Điền các từ sau vào đoạn văn cho phù hợp

being - in - for - sun - lasts - however - cause - used

Viết T hay F cho mỗi câu dưới đây

a) Solar enegry is a cheap, clean, effective soucre of power

b) We have used less fuels nowaday

c) Solar energry  will provide for a very long time

d) Solar energry can be used to cook food..

Câu 12: Đun 3,0 gam CH₃COOH với C₂H₅OH dư ( xúc tác H₂SO₄ đặc ), thu được 2,2 gam CH₃COOC₂H₅

a) Viết phương trình hoá học xảy ra

b) Tính hiệu suất của phản ứng trên

Câu 11: Cho 9 gam axit axetic tác dụng vừa đủ với V ml dung dịch NaOH 1,5M thu được dung dịch X

a) Viết PTHH xảy ra

b) Tính m

c) Cô cạn dung dịch X thu được bao nhiêu muối khan

Câu 10: Cho m gam axit axetic tác dụng vừa đủ với 200 ml dung dịch NaOH 1,5M thu được dung dịch X

a) Viết PTHH xảy ra

b) Tính m

c) Cô cạn dung dịch X thu được bao nhiêu muối khan

Câu 9: Cho 33,2 gam hỗn hợp rượu etylic và axit axetic tác dụng với lượng dư Na thu được X và 6,72 lít khí H₂(đktc)

a) Viết PTHH xảy ra

b) Tính khối lượng mỗi chất trong hỗn hợp ban đầu

c) Cô cạn dung dịch X thu được bao nhiêu muối ( natri etylat và natri exitat )

đặt 10 câu hỏi phản biện lại  quan điểm " học thầy không tày học bạn "

Các câu hỏi phản biện ( chống lại ) " học thầy không tày học bạn "