定义：有三个内角相等凸四边形叫三等角四边形．

    Some students from Thailand write an article on the website(网页). They ask us to save the elephants in Thailand. They tell us that the elephant is one of Thailand's symbols. Their first flag had a white elephant on it. This is a symbol of good 1.

    Elephants are 2 animals. They can play soccer or music. They can also draw very 3. People say that “ An elephant never forgets.” Elephants can walk for a long time and 4 get lost. They can also remember places 5 food and water. This helps 6 to live.

    But elephants are in great danger. Elephants are losing their homes 7 people cut down many trees. People also kill elephants for their ivory. Today there 8 only about 3,000 elephants (over 100,000 before). We must save the trees and not buy things made of ivory. Don't forget that Thai Elephant Day is 9 March 13^th . Let's work together and 10 the elephants!

哺乳动物都是对人类有益的．（判断对错）

艺术是人类的精神食粮。
（1）文艺复兴时期，达芬奇创作的《____ 》对人物的心理刻画，可谓入木三分。
（2）19世纪，俄国批判现实主义文学巨匠____ 被誉为“心理描写大师”。
（3）荷兰画家梵高用线条来勾画人类内心情感的冲动，其代表作品是《____ 》。