Cho 6,72 gam Fe vào dung dịch chứa 0,3 mol H₂SO₄ đặc, nóng (giả thiết SO₂ là sản phẩm khử duy nhất). Sau khi phản ứng xảy ra hoàn toàn, thu được

A. 0,12 mol FeSO₄

B. 0,03 mol Fe₂(SO₄)₃ và 0,06 mol FeSO₄

C. 0,02 mol Fe₂(SO₄)₃ và 0,08 mol FeSO₄

D. 0,05 mol Fe₂(SO₄)₃ và 0,02 mol Fe dư

Vì sao cách mạng nổ ra ?

Mark the letter A, B, C or D to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

Question 2

A. bought

B. caught

C. ought

D. laughed

Two students are talking about the school curriculum.

- Hoa: “Swimming should be taught in the school.” - Nam: “ _________ .It is an essential life skill.”

A. Oh, that’s a problem

B. I can’t agree with you more

C. Not at all

D. You can make it

Kelly: “It’s was very kind of you to give me a lift home”.

- Mark: “_________ ”

A. As a matter of fact, you’re pretty nice.

B. Oh, don’t do that. I was coming past your house any way.

C. I’m not pleased.

D. Oh, don’t mention it. I was coming past your house any way.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.

Back in the 1960s and 1970s, the world was becoming more aware of the destructive effects of industry (23)__________the environment and people were starting to think seriously about ways of protecting the environment. One man who was particularly affected by this subject was Gerard Morgan-Grenville. As Morgan- Grenville travelled round earning his living as a gardener, he noticed signs of the damage that was being done to the countryside around him. It wasn't long before Morgan-Grenville decided that he had to do something about this situation. He felt that if people could be shown a better way of living then maybe they would be interested enough to try to protect their (24)__________environment.

Mr. Morgan-Grenville decided to set up a project (25)__________would prove what was happening to our surroundings and what could be done about it. So, in 1975, Morgan-Grenville created the Centre for Alternative Technology (CAT) in a village in Wales.

The main aim of CAT is to search for an ecologically better way of living by using technology which (26)__________no harm to the environment. One of the most important things CAT did initially was to explore and demonstrate a wide range of techniques and to point out which ones had the least destructive results on the world around us. (27) __________CAT provides information and advice to people all over Britain and all over the world. If more and more individuals are informed about how much damage our modern lifestyle is causing to the planet, maybe more of them would be prepared to look for practical solutions to environmental problems.

Điền vào ô trống 26

A. gets 

B. makes 

C. plays 

D. does

Thí nghiệm nào sau đây thu được kết tủa sau khi kết thúc phản ứng?

A. Nhỏ từ từ đến dư dung dịch NH₃ vào dung dịch CuCl₂

B. Sục khí H₂S vào dung dịch AlCl₃

C. Hòa tan urê trong dung dịch nước vôi trong dư

D. Nhỏ từ từ đến dư dung dịch H₂SO₄ vào dung dịch NaAlO₂

Noãn bình thường của một loài cây hạt kín có 12 nhiễm sắc thể đơn. Hợp tử chính ở noãn đã thụ tinh của loài này, người ta đếm được 28 nhiễm sắc thể đơn ở trạng thái chưa tự nhân đôi. Bộ nhiễm sắc thể của hợp tử đó thuộc dạng đột biến nào sau đây?

A. 2n + 1

B. 2n + 1 + 1

C. 2n + 2

D.2n + 2 + 2