1．紅水河流域?qū)儆?u>           水系。該河段著名的水電站有            電站。

8、    晨昏線的判讀

一是根據(jù)地球自轉(zhuǎn)方向：順著方向由夜到晝?yōu)槌烤�，由晝到夜為昏線。

二是根據(jù)晝夜半球判斷：晝半球西為晨線東為昏線，夜半球西為昏線東為晨線。

7、    確定正午太陽高度

直射點(diǎn)所在緯線正午太陽高度為90度，H=90度-該地地理緯度與太陽直射點(diǎn)緯度差。

6、    確定太陽出沒時刻。

緯線與晨線的交點(diǎn)為日出時刻，緯線與昏線交點(diǎn)為日落時刻，同一緯線日出日落時刻相同。

5、    確定晝夜長短

晨昏線將地球上的緯線分為晝弧和夜弧兩部分，晝弧和夜弧的長短決定晝長和夜長�；《�15度為1小時。

4、    確定季節(jié)

二分日晨昏線過極點(diǎn)，二至日晨昏線與極圈相切

3、某地地方時

赤道與晨線的交點(diǎn)為6時，昏線與赤道的交點(diǎn)為18時，直射點(diǎn)所在的經(jīng)線為12時，同一經(jīng)線地方時相同，不同經(jīng)線東加西減(1度4分鐘)

2、確定太陽直射點(diǎn)位置

 在平分晝半球的經(jīng)線上

1、 確定南北極

(1)、通常上北下南；(2)、自轉(zhuǎn)方向逆時針為北極，順時針為南極；(3)、經(jīng)度東經(jīng)度自西向東逐漸增大。

答案：Ⅰ. 1 ― 5 BDDAA  6 ―10 CABDA  11 ― 15 CCADB  16 ― 20 DBACD  21 ― 25 BDBAC  Ⅱ. 1 ― 5 DBCBA  6 ― 10 CABCA  11 ― 15 CDDAD  16 ― 20 BAAAD   21 ― 25 CBDAB  Ⅲ. 1―5 DACCD  6 ―10 ACDBC 11 ― 15 CFEGD  Ⅳ . 1 . darkness / dark 2 . journey 3 . forced 4 . simple 5 . forehead 6 . wonder 7 . length 8 . satisfied 9 . smelly 10 . zones  Ⅴ . 1 . expected→expecting 2 . 去掉 reached 后面的 to 3 . usually→usual 4. same→the same 5 . 去掉 in 6 . 去掉 for 7 . √  8 . 在 much 前加 how 9 . spend→spending  10 . anyone→everyone

Ⅵ . One possible version:

Dear Mr Zhang ,

We know that this is the last lesson that you will give us . Soon we'll graduate and say good-bye to our school . At this moment , we don't know how to express ourselves . All we can say is "Thanks" .

Three years ago when we came to this school , we knew nothing about English . However , with your unselfish help , we have greatly improved our English in listening , speaking , reading and writing . We owe all this to you , because in the past three years , you have been working hard , trying your best to help us . We will remember all those lively and interesting lessons you've given us , which we will never forget .

Now let us all say again , "Thank you ,  Mr Zhang" .