Đề thi thử THPT Quốc gia môn Tiếng Anh trường THPT chuyên Lam Sơn - Thanh Hóa năm 2015

1.1

1.2.

1.3

1.4

1.5

2.1. What is the author’s main purpose in the passage?

2.2. How can hydrogen be used to cut steel?

2.3. The word readily in sentence “Although it would be difficult to remove the oxygen by itself, hydrogen readily combines oxygen to form water, which can be heated to steam and easily removed.” (paragraph 3) could best be replaced by ___.

2.4. The word combining in sentence “Products such as margarine and cooking oils are changed from liquids to semisolids by combining hydrogen with their molecules.” (paragraph 4) is closest in meaning to ___.

2.5. The word them in sentence “Hydrogen also serves to prevent metals from tarnishing during heat treatments by removing the oxygen from them.” (paragraph 3) refers to ___.

2.6. Where in the passage does the author explain why hydrogen is used as a refrigerant?

2.7. What does the author mean in sentence “Although it would be difficult to remove the oxygen by itself, hydrogen readily combines oxygen to form water, which can be heated to steam and easily removed.” (paragraph 3)?