dùng bếp dầu để đun sôi 15 lít nước từ 25 độ c nhiệt dung riêng của nước là c=4200J/Kg.K biết hiệu suất của bếp la 50% ính nhiệt lượng bếp đã cung cấp khi đun nước

4. Choose the correct answers.

1. Many species of wildlife are becoming extinct, the rainforests are being destroyed.

A. therefore B. since C. consequently D. so

2. Hemp can be used to make paper, it could reduce the need for logging.

A. consequently B. due to C. so D. since

3. logging provides jobs and profits, the government is reluctant to control it.

A. so B. Consequently C. Since D. Due to

4. Hemp was grown throughout history its versatility; it can be used to make many different things. A. due to B. because C. since D. as a result 5. Hemp is related to the marijuana plant; it is illegal in many countries. A. so B. due to C. as a result D. because 6. The polluted chemical waste was dumped into the ocean; , the mass of fish died. A. because B. as C. because of D. consequently 7. It was guessed that the fish died a powerful toxin in the sea water. A. because of B. because C. since D. as a result 8. Many species in BC are threatened logging. A. so B. because C. since D. due to 9. Smoking can heart disease. A. lead to B. create C. causes D. due to 10. Radioactive pollution is increasing the increased use of radioactivity. A. as B. since C. because of D. because

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