A. SAFELY B. SAFER C. SAFETY D. MORE SAFEII. READ THE PASSAGE BELO...

45. A. safely B. safer C. safety D. more safeII. Read the passage below and choose the best answer (A, B, C or D) to each question. Dinosaurs were reptiles that lived during a period of earth's history called the Mesozoic Era, which is also known asthe Age of Reptiles. The first dinosaurs appeared more than 200 million years ago. For many millions of years, they dominatedthe land with their huge size and strength. Then about 65 million years ago, they died out rather suddenly, never to re-emerge.The word "dinosaurs" comes from two Greek words meaning "terrible lizard". Dinosaurs were not lizards, but their appearancecould be truly terrifying. The', biggest ones weighed more than ten times as much as mature elephant and nearly equaled the'size of most modern-day whales. The famous kinds of dinosaurs, including the brontosaur and tyrannosaurus rex, reached 80to 90 feet in length. Not all dinosaurs were giants, however; some were actually not larger than a chicken.Scientists still do not know what caused dinosaurs to disappear. One theory involves a change in the earth's climate. Itis believed that temperatiires dropped significantly towards the end of the Cretaceous Period. Too large to hibernate and nothaving fur or feathers for protecting, it is possible that the climate became too chilly for dinosaurs. In contrast, other specieshaving protection, such as the mammals and birds, were able to survive.