1．了解有关放射性核素和放射性衰变的概念； 2．会正确书写核化学方程式； 3．了解放射性碳-14测定年代法； 4．了解核能和核能利用的基本概念； 5．简单了解人工核反应和超铀元素合成的基本内容。 18.1 放射性核素和放射性衰变 Radioactive nuclide and radioactive decay 18.2 核能和核能利用 Nuclear energy and use of nuclear energy 18.3 人工核反应和超铀元素的合成 Artificial nuclear reaction and syntheses of transuranium elements

Directions: In this section you will hear ten short conversations At the end of each conversation, a question will be asked about what was said. Both the conversation and the question will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A), B), C)and D), and decide which is the best answer. Then mark the corresponding letter on the answer sheet with a single line through

Topics Covered Stocks and the Stock Market Book Values. Liquidation Values and Market values Valuing Common Stocks Simplifying the Dividend Discount Model Growth Stocks and Income Stocks Irwvin McGraw-Hill

I. Perfectly Competition Characteristics and profit outlook Effect of new entrants II. Monopolies Sources of monopoly power. Maximizing monopoly profits. Pros and cons III. Monopolistic Competition

Topics Covered Bond Characteristics reading the financial pages Bond Prices and Yields Bond prices and interest rates YTM VS. current yield Rate of Return Interest Rate Risk The Yield Curve Nominal and Real Rates of Interest

Words and Phrases Direction: you are going to hear some of track and field world records. Complete the Chart. Pay special attention to the country and the records. Events

Unit 10 For Peace and Development Section A Words and Phrases Direction: Listen to some statements about China's economic development. Fill in the blanks with numbers

Words and Phrases Section A: Here are some announcements broadcast at some airports. Listen carefully to each announcement and pay special attention to flight numbers, departure times and boarding gate numbers. Write down in the correct space. Airlines Destination Flight No. Departure Boarding Time Gate

Directions: People in all countries enjoy gifts. Sometimes the meaning are different in different cultures. Listen to the following dialogues and look at the pictures below. If it is not a proper gift in a certain country for an ordinary friend, cross out (×) the picture and check (√) the correct reason why it is a proper gift

General outline small digestive glands distributed in the wall of digestive tract esophageal glands, gastric glands and intestine glands large digestive glands outside the wall of digestive tract salivary glands, liver and pancreas