khoahoc.vietjack.com

Danh sách câu hỏi ( Có 2,497,480 câu hỏi trên 49,950 trang )

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 38 to 42. Tsunami is a Japanese word which means harbour wave and is used as the scientific term for seismic sea wave generated by an undersea earthquake or possibly an undersea landside or volcanic eruption, when the ocean floor is tilted or offset during an earthquake, a set of waves is created similar to the concentric waves generated by an object dropped into the water. Most tsunamis originate along the Ring of Fire, a zone of volcanoes and seismic activity, 32,500 km long that encircles the Pacific Ocean. Since 1819, about 40 tsunamis have struck the Hawaiian Islands. A tsunami can have wavelengths, or widths, of 100 to 200 km, and may travel hundreds of kilometers across the deep ocean, reaching speeds of about 725 to 800 kilometres an hour. Upon entering shallow coastal waters, the wave, which may have been only about half a metre high out at sea, suddenly grows rapidly. When the wave reaches the shore, it maybe 15 m high or more. Tsunamis have tremendous energy because of the great volume of water affected. They are capable of obliterating coastal settlements. Tsunamis should nót be confused with storm surges, which are domes of water that rise underneath hurricanes or cyclones and cause extensive coastal flooding when the storms reach land. Storm surges are particularly devastating if they occur at high tide. A cyclone and accompanying storm surge skilled an estimated 500,000 people in Bangladesh in 1970. The tsunami which struck south and southeast Asia in late 2004 killed over 200 thousand people. What does the word “concentric” in paragraph 1 mean?

Xem chi tiết 548 lượt xem 4 năm trước

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 33 to 37. The story of gold is an adventure involving kings, queens, pirates, explorers, conquerors, and the native people they conquered. Throughout history, gold has (33) _____________a magic spell over those it touched. Gold is beautiful and rare; a soft shiny metal that can be moulded into many shapes. It has been used for money, jewelry, and to decorate special buildings such as palaces and places of worship. (34) _____________the precious metal was discovered, prospectors rushed to mine it, starting new cities and countries as they went. Gold and the people who love it have helped shape the world we live in today. Gold is one of many elements, or substances that cannot be changed by normal chemical means, that are found in the Earth's crust. Gold has a warm, sunny colour and (35) _____________it does not react with air, water, and most chemicals, its shine never fades. In its natural (36) _____________, gold is soft and easily shaped, when heated to 1,062 Celsius it melts and can be poured (37) _____________moulds to form coins, gold bars, and other objects. Stories have been told, movies made and legends born about the discovery of the world's great gold deposits. It is a saga of dreams, greed, ambition and exploration.

Xem chi tiết 531 lượt xem 4 năm trước