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.

Niagara Falls, one of the most famous North American natural wonders, has long been a popular tourist destination. Tourists today flock to see the two falls that actually constitute Niagara Falls: the 173-foot- high Horseshoe Falls on the Canadian side of the Niagara River in the Canadian province of Ontario and the 182-foot-high American Falls on the U.S. side of the river in the state of New York. Approximately 85 percent of the water that goes over the falls actually goes over Horseshoe Falls, with the rest going over American Falls.

Most visitors come between April and October, and it is quite a popular activity to take a steamer out onto the river and right up to the base of the falls for a close-up view. It is also possible to get a spectacular view of the falls from the strategic locations along the Niagara River, such as Prospect Point of Table Rock, or from one of the four observation towers which have heights up to 500 feet.

Tourists have been visiting Niagara Falls in large numbers since the 1800's; annual visitation now averages above 10 million visitors per year. Because of concern that all these tourists would inadvertently destroy the natural beauty of this scenic wonder, the State of New Y ork in 1885 created Niagara Falls Park in order to protect the land surrounding American Falls. A year later Canada created Queen Victoria Park on the Canadian side of the Niagara, around Horseshoe Falls. With the area surrounding the falls under the jurisdiction of government agencies, appropriate steps could be taken to preserve the pristine beauty of the area.

The word “flock” in paragraph 1 could best be replaced by_________.

A. come by plane

B. come in large number

C. come out of boredom

D. come without knowing what they will see

1 . Ta có : a/b + b/a = a/a = b/b = 1+1=2. Vậy a/b + b/a = 2 hoặc > 2

2 . Bài  này mình đang nghĩ . ( **** cho minh nhé ) . ngoa

Đặc điểm nông nghiệp Trung và Nam Mỹ :

- Có 2 hình thức sở hữu trong nông nghiệp :

+ Đại điền trang: qui mô lớn do đại điền chủ quản lí.

+ Tiểu điền trang: qui mô nhỏ do hộ gia đình làm chủ.

- Trồng trọt:

+ Nông sản chủ yếu: cây công nghiệp và cây ăn quả.

+ 1 số nước phát triển lương thực ( Nam Mỹ).

+ Ngành trồng trọt mang tính độc cạnh do lệ thuộc vào nước ngoài.

+ Phần lớn các nước Trung và Nam Mỹ phải nhập khẩu lương thực.

- Chăn nuôi và đánh cá:

+ Chăn nuôi bò phát triển ở Bra-xin, Ac-hen-ti-na, U-ru-goay, Pa-ra-goay.

+ Cừu, lạc đà nuôi chủ yếu trên sườn núi Trung An-đét.

+ Đánh cá phát triển ở Pê-ru.