Cho m gam hổn hợp Fe, Ag tác dụng đủ với 300 ml dung dịch H2SO4 C% (d= 1,84g/ml) thu được 3,36 lít khí H2 đktc và dung dịch Y. Nếu cũng cho X tác dụng với H2SO4 đặc, dư thu được 13,44 lít SO2 đktc sản phẩm khử duy nhất. Tính thành phần trăm số mol, khối lượng mỗi chất trong X và C%

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 28 to 34.

        Foot-racing is a popular activity in the United States. It is seen not only as a competitive sport but also as a way to exercise, to enjoy the camaraderie of like-minded people, and to donate money to a good cause. Though serious runners may spend months training to compete, other runners and walkers might not train at all. Those not competing to win might run in an effort to beat their own time or simply to enjoy the fun and exercise. People of all ages, from those of less than one year (who may be pushed in strollers) to those in their eighties, enter into this sport. The races are held on city streets, on college campuses, through parks, and in suburban areas, and they are commonly 5 to 10 kilometers in length.

        The largest footrace in the world is the 12-kilometer Bay to Breakers race that is held in San Francisco every spring. This race begins on the east side of the city near San Francisco Bay and ends on the west side at the Pacific Ocean. There may be 80,000 or more people running in this race through the streets and hills of San Francisco. In the front are the serious runners who compete to win and who might finish in as little as 34 minutes. Behind them are the thousands who take several hours to finish. In the back of the race are those who dress in costumes and come just for fun. One year there was a group of men who dressed like Elvis Presley, and another group consisted of firefighters who were tied together in a long line and who were carrying a fire-hose. There was even a bridal party, in which the bride was dressed in a long white gown and the groom wore a tuxedo. The bride and groom threw flowers to bystanders, and they were actually married at some point along the route.

Which of the following is NOT mentioned in this passage?

A. Some runners looked like Elvis Presley

B. Some runners were ready to put out a fire

C. Some runners were participating in a wedding

D. Some runners were serious about winning

Trên tia Ox, vẽ hai đoạn thẳng OA và AB sao cho OA = 6cm, AB = 2 cm.

Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that

best fits each of the numbered blanks from 31 to 35.

Early writing and Alphabets

When people first began to write, they did not use an alphabet. Instead, they drew small pictures to (31) _______ the objects they were writing about. This was very slow because there was a different picture for every word.

            The Ancient Egyptians had a (32) _______of picture writing that was called hieroglyphics. The meaning of this writing was forgotten for a very long time but in 1799 some scientists (33) _______ a stone near Alexandria, in Egypt. The stone had been there for over a thousand years. It had both Greek and hieroglyphics on it and researchers were finally able to understand what the hieroglyphics meant.

          An alphabet is quite different from picture writing. It (34) _______of letters or symbols that represent a sound and each sound is just part of one word. The Phoenicians, who lived about
3,000 years ago, developed the modern alphabets. It was later improved by the Roman's and this alphabet is now used (35) _______ throughout the world.

Điền vào ô 34.

A. consists

B. includes

C. contains

D. involves

Con hãy điền chuộc hoặc chuột vào chỗ trống thích hợp:

a. ... lỗi.

b. ... rút.

c. con ...