题干

据权威刊物报道,1996年科学家在宇宙中发现H3分子。甲、乙、丙、丁四位学生对此报道的认识正确的是

A:甲认为上述发现绝对不可能,因为H3分子违背了共价键理论

B:乙认为宇宙中还可能存在另一种氢单质,因为氢元素有三种同位素必然有三种同素异形体

C:丙认为H3分子实质是H2分子与H+以特殊共价键结合的产物,应写成H3+

D:丁认为如果上述的发现存在,则证明传统的价键理论有一定的局限性有待继续发展

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D

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    Traveling to all corners of the world gets easier and easier. We live in a global village, but this doesn't mean that we all behave in the same way.

    How should you behave when you meet someone for the first time?____In Japan, you should bow, and the more respect you want to show, the deeper you should bow. In Thailand, people greet each other by pressing both hands together at the chest.____

    ____ In Muslim countries, you shouldn't expose your body, especially women, who should wear long blouses and skirts. In Korea, you should take off your shoes when entering a house. Remember to place them neatly together where you come in.

    In Spain, lunch is often the biggest meal of the day, and can last two or three hours.____ In Mexico, lunch is the time to relax, and many people prefer not to discuss business as they eat. In Britain, it's not unusual to have a business meeting over breakfast.

    In most countries, an exchange of business cards is necessary for all introductions. It should include your company name and your position. If you are going to a country where your language is not widely spoken, you can get the back side of your card printed in the local language.____

A. For this reason, many people eat a light breakfast and a late dinner.

B. As the saying goes, "when in Rome, do as the Romans do."

C. In both countries, eye contact is avoided as a sign of respect.

D. In China, you may present your card with the writing side up.

E. An American shakes your hand while looking into your eyes.

F. Many countries have rules about what you should and shouldn't wear.

G. Don't make any noise when you eat or drink soup.