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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