题目

Mary Cassatt is considered one of America’s most famous female artists．     She was born in Pennsylvania in 1844．When she was a child，Mary and her family spent five years travelling and living in Europe．Mary saw the great art museums，and she wanted to become an artist．     When she was seventeen，she said that she wanted to go to Paris to study art．At that time people thought that only men could become painters．It was not considered proper work for a woman Her father refused to let her study art．Finally he said she could study it if she went to a school near their ho为了解决自然资源紧张问题，一要“开源”，二要“节流”。据此回答问题。1.海水淡化可以扩大淡水来源，目前世界上做得最好的国家是A.中国B.美国C.埃及D.沙特阿拉伯2.下列做法属于“节流”的是A.在丘陵地区修筑梯田B.植树造林，退耕还草C.矿产开采中采大弃小，采富弃贫D.农业生产中应用滴灌、喷灌技术3.对非可再生的资源来说，“开源”的最好办法是A.限制利用B.寻找新资源C.禁止开采D.综合利用