If the wind is blowing from the side, it is blowing across the boat. In this case, you must keep the sail half way outside the boat. It should be at a 45°angle to the boat. It needs to be out far enough to catch the wind, but it shouldn't flap(摆动)．It shouldn't look like a flag on a flagpole. If it is flapping, it is probably out too far, and the boat will slow down.

　　Sailing into the wind is not possible. If you try, the sail will flap and the boat will stop. You may want to go in that direction. It is possible, but you can't go in a straight line. You must go first in one direction and then in another. This is called tacking. When you are tacking, you must always keep the sail inside the boat.

　　45. What should you consider first while sailing?

　　A．Sailors' strength.

　　B．Wave levels.

　　C．Wind directions.

　　D．Size of sails.

　　46．What does the word “It” underlined in Paragraph 4 refer to?

　　A．The boat.

　　B．The wind.

　　C．The sail.

　　D．The angle.

　　47．What do you have to do when sailing against the wind?

　　A．Move in a straight line.

　　B．Allow the sail to flap.

　　C．Lower the sail.

　　D．Tack the boat.

　　48．Where can you probably find the text?

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