Unit 2 Sailing the oceans Period 1 Warming Up，Pre­reading & Reading 同步精练（人教版选修9，课标通用）

　　时间：45分钟

　　.介、副词填空

　　1．The voyages of travellers before the 17th century show that they were not________the mercy________the sea even though they did not have modern navigational aids.

　　2．On a clear day especially during the summer the sailors could use the sun overhead________midday to navigate by.

　　3．There is a special cloud formation which indicates there is land close________.

　　4．An early method of measuring speed involved throwing a knotted rope tied________a log over the side of the ship.

　　5．The number of knots that were counted________a fixed period of time gave the speed of the ship in nautical miles per hour.

　　6．________this way the ship could set a straight course even in the middle of the ocean.

　　7．________， it was awkward to use as one of the points of reference was the moving ship itself.

　　8．As the ship rose and plunged in the waves, it was________difficult to be accurate with any reading.

　　9．It works________measuring the angle between two fixed objects outside the ship using two mirrors.

　　10．This gave the seamen the local time and allowed them to find their latitude________sea.

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