V. Mark the letter A, B, C, or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following sentences.

1. Each day, the kidneys process about 200 quarts (50 gallons) of blood to filter out about 2 quarts of waste and water.

A. remove                   B. take in                     C. take off                   D. separate

2. Though the tongue may seem like a simple organ, it has a wide range of purposes, such as licking, breathing, tasting, swallowing and articulating speech.

A. making                   B. delivering               C. giving                     D. broadcasting

3. The acid also works to kill harmful microbes that may have made their way into the body along with food and drink.

A. attended                 B. entered                   C. touched                  D. attacked

4. To survive and reproduce, the human body relies on major internal body organs to perform certain vital functions.

A. private                    B. personal                  C. inside                      D. inner

5. The major organ in the body of human beings is the brain which is primarily responsible for performing all the functions and actions of the body.

A. having                    B. fulfilling                 C. working                  D. showing

Đốt cháy hoàn toàn 10 gam hỗn hợp gồm C và S người ta phải dùng 11,2 l O2 ở đktc. Hãy tính khối lượng mỗi chất trong hỗn hợp ban đầu và thể tích hỗn hợp khí sinh ra ở đktc.