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当资源不足时,物种之间为利用资源而产生的竞争称为__________。
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第1空:[ "参考解析: 资源利用性竞争" ]
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What is the biggest city in the world? That is, __1__ city has the largest population? This seems like __2__ question to answer, but actually it isn't. It's actually rather difficult to say which cities __3__ the largest. There are two reasons for this difficulty. First of all, it isn't easy to determine a city's boundaries, that is, where a city ends. Nowadays, nearly all cities have a large __4__ area around them. So when we talk about the population of a city, we often mean the population of the whole metropolitan area around the city. That means that it's difficult to determine what the population of a city is because it's difficult to define what a city is. The second reason that it is difficult to __5__ the population of different cities is this: it is almost impossible to get __6__ about the population of all cities for the same year. For example, we might get an estimate of New York's population in 1979 an __7__ of Mexico City's population in 1981. So we really can't compare the numbers because the information is for __8__ different years. the population of cities changes rather quickly, especially in some cases. For example, the population of Beijing, China may increase by 5% each year, so the population figure will change rather quickly. So we can say that these are our two __9__ for comparing the populations of cities: one, it's difficult to determine the __10__ of a city, two, it is difficult to get accurate information. 1. A. what B. which C. where D. how
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