下列对三江源地区的描述，错误的是（    ）

①“鸟的天堂”真是鸟的天堂。

②海上日出真是伟大的奇观。

③多得些知识不是坏事。

完形填空

    I have a good friend. His name is Tom. He is a nice boy, but he eats too1  and doesn't like sports. He has a big2 every morning. He has four eggs, 3 of bread and butter and 4 big glass of milk for it. 5 lunch, he eats two hamburgers, a lot of French fries of chicken. He 6 a lot of cola or soda, too. For dinner, he likes beef and salad. He7 eats beef, chicken, hamburgers, and eggs. He likes ice cream, cola and soda, 8. Too much food is not 9 for health. So Tom is very 10.

青少年异性交往一直是备受社会关注的一个话题，异性交往不仅不可避免而且很有必要，关键是掌握交往技巧，那么青少年异性之间的交往应该（    ）