sound reflections are used to create pictures of bones and organs(器官). These pictures can help doctors find problems. 根据材料内容,从下面五个选项中选出能填入文中空缺处的最佳选项,使文 章意思通顺、内容完整。 A. Echoes have medical uses as well. B. Some humans can do something similar. C...
The first dinosaur bones were found in the early 19th century. The Giant’s Causeway,formed by volcanic (火山的) activity 60 million years ago, is also a good choice. ·The CairngormsThe Cairngorms have some of the country’s highest mountains and are the best places for skiing in ...
When I was two years old, something happened which I have never forgotten. It was early spring, and there was a light mist over the trees and fields. The other young fellows and I were feeding at the lower end of the field when we heard the distant cry o
When you were born, the bridge between the right and left brain was not fully developed.Because of this all your actions of seeing, hearing and learning came from both sides of your brain. Your two hemi- spheres were both alike. By the time you were two
Weaning is the first step in life to help children develop comprehensively and perfect their eating ability later on. However, families with children for the first time are still confused about when to introduce solid foods to their babies, what is the best weaning menu, what foods children ...
Vitamin D is really important for our bones (骨骼). When we are young, vitamin D builds up our bones and makes them strong. When we are older, we still need vitamin D to keep our bones strong. Our bodies keep the vitamin D in our bones and teeth. Then we lose vitamin D as we ...
Several months ago, I developed a strange rash near each eye on my upper cheeks. It’s been there for months. Five days on Paleo and it’s completely gone. Also, no more upset stomach. Here are some examples of what I’ve been eating. Breakfast usually consists of lots of bacon (...
British scientists say they have developed a new material called Armourgel that could help protect older adults from breaking bones when they fall. Scientists say it is soft enough to be put in normal everyday clothing. As people get older man
Because the site is elevated and water is too deep to access, a complex system of aqueducts and cisterns was developed, including a charcoal filtration process to purify the water. There are hundreds of masks of Chaac, the rain god, with his large spout-like nose representing the rays of ...
61. lung cancer, like some other cancers, often doesn't produce until it is too late and has spread beyond the chest to the brain, liver or bones. a) trails b) therapies c) symptoms d) symbols 62. with the increasing unemployment rate, workers who are 50 to 60 years old are usually...