–Maps are very useful people who often travel, aren’t they? - . A. for; Yes, they are B.——青夏教育精英家教网—

7. –Maps are very useful ____ people who often travel, aren’t they?　 -____.

　 A. for; Yes, they are　 B. for; No, they aren’t　 C. to; Yes, they are

6. –Do you know ____?　 -In Harbin.

　 A. where the Sun Island is　 B. where is the Sun Island　 C. where the Sun Island be

5. –I hear that compass was first ____ by Chinese long before.　 –You are right.

　 A. useful　 B. used　 C. use

4. –Is it easy to find the way ____ short distances?　 -Yes, it is.

　 A. of　 B. to　 C. over

3. –I don’t know ____ to get there?　 -Don’t worry, I will give you some ____.

　 A. how, direction　 B. when, method　 C. how, directions

2. -____ is it from your home?　 -1,000 meters.

　 A. How long　 B. How far　 C. How often

1. -____ did you ____ to find the way?　 -A compass and a map.

　 A. What, use　 B. What, used　 C. Which, useful

26．小明将一张矩形纸片沿对角线剪开，得到两张全等直角三角形纸片(如图2)，量得他们的斜边长为10cm，较小锐角为30°，再将这两张三角纸片摆成如图3的形状，使点B、F、D在同一条直线上，F为公共直角顶点。然后小明又将图(3)中的△ABF沿直线AF翻折到图(4)的位置，点B落在FD边上的B₁点，AB₁交DE于点H。

请你说明：(1)AH=DH.；(2)点H在∠AFD的角平分线上。