4.B.答案即在“Dig a small hole in the front of the nest as a door. The ‘door’ is from 3cm to 5cm. So the bird can fly in or out easily.”一句中。

3.D.根据生活常识及“Don't make the boards too slippery.”一句可得答案。

2.C.由文章作者在文中所流露出的感情以及生活常识可知。

1. A。 观察鸟类的活动，首要的是找一个鸟窝。显然，答案就在“If we find a bird nest, we will have a good place of observing(观察)and knowing about birds.”这句话中。

3.C 。这由文中介绍Laredo，Amarillo这两个城市的气候可以得出。

　　Passage 79

　[答案与解析]这是一篇图文并茂的说明文。如果你想了解鸟妈妈是怎样给小鸟喂食及鸟类的其它活动，你最好躲在鸟窝附近用双筒望远镜观察。那么，怎么样制作鸟窝呢？文中介绍了五条建议：(1)准备六块不太光滑的木板；(2)在前面挖一个3至5厘米的洞；(3)确保雨水进不到窝内；(4)其中的一块木板容易打开；(5)染上颜色。

2.C.由短文第一段的大意，尤其是“Different parts of the state have very different kinds of weather.”一句。 再由“If anyone asks you about the weather in Texas, ask him, What part of Texas do you mean？”最后的这句话，可知Laredo，Amarillo是的两个地方。故Texas包括Laredo和Amarillo。又根据“…which is a northern city.”这句话可知应在的北方。故答案为C。

1. B。根据文章的首句“Texas was the biggest state(州)before Alaska became the forty-ninth state in 1959.”可以找到答案。而实际上其它三处选项都有明显的错误。

5.We should do some good things for the people after us. 那位有钱的人听了老人的这一席话，深受启发。他说的“We should do some things for the people after us.”这句话就是答案的出处。

　Passage 78

　[答案与解析]这篇文章的大意是：阿拉斯加成为美国的第四十九个州之前，得克萨斯州是美国最大的州。在这个州不同的地区，天气差异很大。文中提到了夏季最热的城市Laredo和冬季很冷的北方城市Amarillo。

4.Yes, he did. 答案就在“‘Sure,’ the man did not know why he asked this question.”这句话当中。

3.No，he wasn't. He was planting the tree for the people after him to enjoy. 从“You are planting a very young tree now and it'll take years to give fruit. You certainly don't hope to live long enough to get any fruit from this tree.”中可看出答案是否定的。而其原因则隐含在“…and I am doing the same for the people after me.”中。