题目

我国某自然保护区因地震导致山体滑坡的30年后，科研人员对山体滑坡区域的恢复群落和未受千扰的原始林群落不同植被类型的相关情况进行了调査研究。 (1)调査发现，在两个群落中都有同种马尾松，但具体分布相差较大，一个区域内的全部马尾松可称为一个           。科研人员通常以不同胸径大小的马尾松个体数代替其           ，来进一步预测      的变化趋势。 (2)生物量是指某一调查时刻单位面枳内现存生物的有机物总量。科研人The first chocolate was eaten by people in South America hundreds of years ago. In those days, the people did not really eat chocolate. They used the cocoa bean（可可豆）to make a chocolate drink and they enjoyed it very much. Many years later, the cocoa bean was brought to other countries and people came to love the taste of chocolate. In 1824, John Cadbury opened a small shop in Britain. One of the things he sold was chocolate drink. In 1831, he opened a factory to make chocolate drink. He wanted to encourage people to drink chocolate instead of other drinks. A few years later, a man called Joseph Fry found a way to make chocolate instead of only drinking it. But at that time chocolate was very expensive and only the rich people could buy it. Later, more and more chocolate bars were produced and sold, it became cheaper. However, at first only plain chocolate （a kind of chocolate without milk and with very little sugar）was produced. Milk chocolate came later and this was made by adding milk to the chocolate. The first milk chocolate bar was made in Cadbury’s factory in 1897. Their most famous chocolate, Cadbury’s Milk Bar, was made in 1905. It has been the most popular chocolate in Britain and around the world for over 100 years. The Cadbury factory is still in Britain and the chocolate produced there is eaten all over the world. Every year, thousands of visitors visit the factory in order to see how chocolate is made.【小题1】Hundreds of years ago, people first began to drink chocolate in           .A．South AmericaB．South AfricaC．BritainD．Australia【小题2】John Cadbury opened a factory to make chocolate drink in          .A．1824B．1831C．1897D．1905【小题3】People had the chance to eat chocolate instead of drinking it for the first time          .A．when chocolate was cheaperB．when more and more chocolate was producedC．when John Cadbury started to make chocolate drinkD．when Joseph Fry found a way to make chocolate.【小题4】At first, not many people bought chocolate          .A．because it was very expensive B．because people didn’t like the tasteC．because they wanted to have other drinksD．because there was no chocolate sold in the shops【小题5】Cadbury’s Milk Bar        .A．was first made in 1897B．is a kind of plain chocolateC．is famous neither in Britain nor in AmericaD．is popular not only in Britain but also around the world