【正文】 at provide strong protection for teeth. One of the pounds in chocolate, CBH, is shown to protect even more effectively than fluoride.Tooth decay happens when bacteria work to turn sugar into acids in our mouth. This is why eating foods with high sugar content can lead to more tooth decay. The pounds in chocolate, however, are antibacteria and can fight against bacteria in your mouth. The CBH pound in particular also works to strengthen tooth enamel （牙釉質(zhì)），and protects against tooth decay.Does this mean you can cat as much chocolate as you want without worrying about your teeth? It depends on the types of chocolate that you like. The protective effect of chocolate is most effective .when you chew on cocoa beans. Of course, this option is not very appealing to。s family was a musician, but his grandfather bought him his first keyboard when he was 3 years old. It didn39。s Store , Don39。s an amazing acplishment and one we cannot achieve without generous support from individuals, corporations, and other social organizations. Visit pacific science center. org to find various ways you can support Pacific Science Center.1. Where can you buy a souvenir at Pacific Science Center?A. In Building 3. B. In Building 1.C. At the Laser Dome. D. At the Denny Way entrance.2. Winch of the following about the Pacific Science Center is NOT true?A. You can have lunch there.B. The exhibits there will feed your mind.C. There is no place to store your belongs.D. Pushchairs and wheelchairs are available to rent.23 . What is the purpose of the last part of the text?A. To tell about the Center39。s too young and they don39。t hold my hand much anymore. I told myself it was part of growing up, and I should just be glad they could do things on their own now. But when you39。t predict or feel that the roads have bee icy like an experienced driver would. For instance, when a road is icy, a human driver would step on the brakes more gently than when the roads are clean and dry.Another issue is that driverless cars have maps programmed into their memory, but these maps aren39。 knowingB. promisingC, imagining .D. pretending56. A. equally .B. possiblyC. partlyD. accidentally57. A. In either caseB. On the contraryC. What39。s first lootive prototype(機(jī)車原型)using hightemperature superconducting magnetic levitation technology (HTS Maglev高溫超導(dǎo)磁懸浮技術(shù))and the trains will run68 (fast) than any other train in the world as they have been designed to run69 a speed of 620 kilometers per hour. It39。注意：；，多者（從第11處起）不計(jì)分。Dear fellow students,. .. .. .. .. .8