题目

  In 1990, over 100 countries signed 　61　　 international agreement to make it illegal to buy or sell ivory, which is mainly used for jewelry. Most ivory is made from the tusks（象牙) of African elephants. These tusks are    62     (terrible) valuable — one pair is worth more than three times the income of an African farmer or factory worker in a year. Hunting elephants was so profitable    63     from 1979 to 1989 the number of elephants in Africa  64   (fall) from 1.3 million to 600,000. However, thanks to the international agreement, there     65    (be) much less illegal hunting since 1990. But considering    66   (vary) of aspects, it costs a lot of money to preserve elephants. Game wardens (狩猎监督员) must be hired to protect them, land must be set aside for them, and when they destroy a farmer’s crops, the farmer must     67    (pay) compensation(赔偿).   Zimbabwe and four other African countries say that some of the elephants should be killed legally. This will help keep the population stable, and selling the ivory will help pay for preserving the elephants.     68     conservationists say that making ivory legal to sell would lead to even more illegal hunting. Others say   69    is wrong is to kill elephants because they are sensitive animals who feel emotional pain at the death of other elephants. Anyway, people should take immediate and constant measures   70   (protect) elephants.  答案：61. an         62. terribly       63. that         64. fell       65. has been 66. varieties    67. be paid       68. But         69. what      70. to protect

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