完形填空

    The lion is one of the most fierce (凶猛的) animals in the world. Lions can be 1 in Africa and India. Lions in Africa can live without water for about one month. Lions are also popular animals in the 2 . Almost every zoo around the world has a few lions.

    It is very 3 for people to tell male and female lions from each other. You can judge (判断) simply by their appearance. A male lion has mane while female lions do not have. Male lion 4 than female lions. A male lion usually weighs about 200 kilograms which is always heavier than a female lion. Both male and female lions have very 5 mouths. They can break the backs of other animals 6. Lions feed on other animals and one lion usually kills between ten and twenty large animals each year for 7 .

    It's unusual for lions to kill people. However, in 1898 two lions 8 and ate over one hundred people in Kenya before they were shot by a British man named P.J. Patterson. This 9 became the subject (主题) of a 1996 Hollywood movie called The Ghost and the Darkness. Now the Indian lions are endangered. It's really necessary for us to 10 the animals, or we won't see them again. Animals are our friends. It is our obligation to protect them.

阅读下列材料：

材料一  苏联曾宣布1952年的谷物产量达到13000 多万吨。实际上，这一年只生产了9000 多万吨粮食，1953年又降为8250万吨。苏联 1953 年的人均粮食和肉类产量只有432公斤和30公斤，比革命前1913年的540公斤和31.4公斤还要低。

材料二  在第二次世界大战后的年代里，没有一位世界领袖人物的成败能像赫鲁晓夫的成败如此急剧地和决定性地改变历史的进程。

 ——尼克松

请回答：

把肯定句改成双重否定句

①他答应了我们的请求。②孩子们都喜欢他。