【正确答案】
C
【答案解析】[听力原文] In 1990, over 100 countries signed an international agreement to make it illegal to buy or sell ivory, which is mainly used for jewelry. Most ivory is made from the tusks of African elephants. These tusks are very valuable—one pair is worth more than three times that an African farmer or factory worker earns in a year. Hunting elephants was so profitable that from 1979 to 1989 the number of elephants in Africa fell from 1.3 million to 600,000. It was feared that by the year 2000 there would be none left. However, since 1990 there has been much less illegal hunting, thanks to the international agreement. But it costs a lot of money to preserve elephants. Game wardens must be hired to protect them, land must be set aside for them, and when they destroy a farmer's crops, the farmer must be paid compensation. Zimbabwe and four other African countries say that some of the elephants should be killed legally. This would help keep the population stable, and selling the ivory would help pay for preserving the elephants. But conservationists say that making ivory legal to sell would lead to even more illegal hunting. Others say that it is wrong to kill elephants because they are sensitive animals who feel emotional pain at the death of other elephants. What do we learn about the international agreement signed in 1990? 本题题干问关于1990签署的那项国际协议，我们能够了解到什么。文章开头就提到，1990年100多个国家共同签署了一份协议，规定买卖象牙为非法行为，C项与此含义一致，故为答案。需注意C项是对原文的同义转述，原文中buy or sell ivory在正确选项中被转述为make any transactions of ivory。