⑤Keep doing this until you have made several marks.

　　⑥The mark nearest the stick will represent the shortest shadow, which is cast at midday, when the sun is highest in the sky and pointing to the exact south.

　　⑦Pick a point in the distance along the line between the shortest shadow and the stick.

　　⑧That point is south of where you are.

　　⑨Now you can turn the map, like you did before, and find which way you should be travelling.

　　68. To find the direction, we ought to be patient probably because

　　A. it is not easy to find a proper stick

　　B. it is not easy to position the stick

　　C. it takes hours to make the marks

　　D. it takes about half an hour to make the marks

　　69. The passage would probably be most helpful to

　　A. those who draw maps

　　B. those who get lost

　　C. those who make compasses

　　D. those who do experiments

　　70. Which of the following pictures best shows the way of finding the direction of south?

　　71. The author presents this passage by

　　A. telling an interesting story

　　B. describing an activity in a lively way

　　C. testing an idea by reasoning

　　D. introducing a practical methodD

　　D

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