ĐỌC KỸ ĐOẠN VĂN SAU VÀ CHỌN PHƯƠNG ÁN ĐÚNG (A HOẶC B, C, D) CHO MỖI C...

Câu 66- 70: Đọc kỹ đoạn văn sau và chọn phương án đúng (A hoặc B, C, D) cho mỗi câu từ 66 đến 70: The fourth letter of the Greek alphabet was named delta. Its sign was a triangle – a three – sided figure. Today the word deltameans the triangular group of islands at the mouth of a river. Delta are formed by the rivers themselves. Large rivers may carrysand and fine soil as they sweep towards their mouths. Near their outlets, rivers usually slow, and can less easily carry theirburdens. Sand and silt are dropped when rivers enter a larger body of water. Not all rivers form delta. Ocean currents may bestrong enough to sweep the river water away before sand and silt are deposited. Or the deposits may themselves be sweptaway. The fertile soil of the Nile delta has made it famous. Mans history in this delta dates back for thousands of years.