6.The first Americans probably came from Asia to North America 25,000 years ago or more. Over time they developed ways of farming and societies with different languages and cultures. About the time of the Roman Empire, there was a culture of the Mayas in Central America. Mayan society was known to be very advanced with their own system of mathematics and one of the best calendars in the world. They had a system of writing that was like ancient Chinese characters. Around the ninth century the population of the Mayans dropped. No one knows whether there was a problem of a change in the climate, war with other groups, or the wearing out of the soil. It was more than a thousand years later that Columbus discovered America. When he saw land after the trip across the Atlantic Ocean, he thought he was in India. 【題組】The first people to come to America were most likely from________.
(A) India (B) Asia (C) Rome (D) Maya
7.【題組】The Roman Empire was a culture existing________.
(A) 25,000 years ago (B) a thousand years before the Mayan culture
(C) after Columbus discovered America (D) at the same time of the Mayan culture
11.46. Many people do not smoke and do not like smoking. These nonsmokers are very _____1_____ about the bad effects on people’s health from smoking. They have helped _____2_____ laws to restrict smoking in public places. Nonsmokers believe that the smoke from other people can also hurt them. This is true. Scientists also believe that “second-hand smoke,” the smoke that nonsmokers breathe in from smokers, is very _____3_____ . Because of this, many restaurants and offices in the United States and Canada limit the places where people can smoke. Many airlines and hotels do not _____4_____ smoking at all. Things are changing. People want to stay healthy and live better lives.
It is not easy to quit smoking, but it is the smartest thing to do. If you quit smoking, your chance of getting lung cancer decreases within one year after you stop. After ten years, the chance is _____5_____ the same as for nonsmokers. It is possible to quit smoking. You can start leading a healthier and better life today if you make the decision to stop smoking now. Good luck! 【題組】1 (A) happy (B) brave (C) concerned (D) necessary