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 43 to 50.

    Footracing 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 firehose. 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

The main purpose of this passage is to 

A. encourage people to exercise 

B. describe a popular activity 

C. make fun of runners in costume 

D. give reasons for the popularity of footraces 

Biết gia tốc rơi tự do ở đỉnh và chân một ngọn núi lần lượt là 9 , 809   m / s 2  và  9 , 810   m / s 2 . Coi Trái Đất là đồng chất và chân núi cách tâm Trái Đất 6370 km. Chiều cao ngọn núi này là

A. 324,7 m.

B. 640 m.

C. 649,4 m.

D. 325 m.

Hòa tan hoàn toàn Fe₃O₄ trong H₂SO₄ loãng, dư thu được dung dịch X. Cho dung dịch X lần lượt phản ứng với các chất: Cu, Ag, dung dịch; KMnO₄, Na₂CO₃, AgNO₃, KNO₃, KI, Na₂S, NaOH. Số trường hợp có phản ứng xảy ra với dung dịch X là

A. 6

B. 7

C. 8

D. 9

Read the following passage and mark the letter A, B, c, or D on your answer sheet to indicate the correct word for each of the blanks from 66 to 75.

The Eighth Wonder of the World

The Thames Barrier is a major part of the flood defence scheme for protecting London (66)________ rising water levels. The defenses (67)________include raised river embankments and additional flood gates at strategic points, including the Barking Bauier. The unique structure that is the Barrier spans the 520-metre wide Woolwich reach and consists of 10 separate movable gates, each pivoting and supported between concrete structures which house the operating machinery.

When raised, the four main gates (68)________stand as high as a five-storey building and as (69)________as the opening of Tower Bridge. Each (70)________3700 tonnes. During the first twelve years of (71)________, the Barrier has been closed twenty nine times to protect London.

(72)__________ x  file Barrier from the comfortable Cafeteria. Picnic on the riverside embankment. Enjoy beautiful views from the riverside walk. Visit the shop which stocks a large selection of souvenirs, books and Barrier information.

There is a children’s play (73)________suitable for 4 - to 12-year olds, (74)________adjacent to the riverside walk. A visit to the spectacular Thames Barrier is a (75)________experience.

Điền vào ô số 69

A. thick

B. heavy

C. wide

D. fat

Có 3 loại thân chính

- Thân đứng: + Thân gỗ: Cây nhãn, cây xoài, cây bưởi...

+Thân cột: Cây cau, cây dừa, cây cọ...

+ Thân cỏ: Cây cỏ mần trầu, cây hoa hồng...

- Thân bò: Cây rau má, cây dưa hấu...

- Thân leo: Cây rau mồng tơi, cây dưa chuột...

Em hãy nêu quy trình bón phân lót?

Em hãy ghi vào vở bài tập tác dụng phòng trừ sâu, bệnh hại của biện pháp canh tác và sử dụng giống cây chống sâu, bệnh theo mẫu bảng sau:

Cho các phản ứng sau:

( 1 )   S + O 2 → S O 2 ( 2 )   S + H 2 → H 2 S ( 3 )   S + 3 F 2 → S F 6 ( 4 )   S + 2 K → K 2 S

S đóng vai trò chất khử trong những phản ứng nào?

A. Chỉ (1)

B. (2) và (4) 

C. chỉ (3)

D. (1) và (3)