高考英语二轮复习 unit2 period 1 Warming Up，Pre reading Reading同步精炼 新人教版选修9.docVIP

Unit 2 Sailing the oceans Period 1 Warming Up，Pre-reading 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. 答案　1.at；of　2.in　3.by　4.to　5.during　6.In 7．However　8.extremely　9.by　10.at .单词拼写 1．This was a more p________and simplified version of the astrolabe. 2．So seamen could follow the birds to land even if they were o________and in the open sea. 3．This seems to have been the first and most useful form of e________which carried the minimum amount of risk. 4．Can you help me u________the files? 5．It was the first i________to measure the suns position. 6．It was easier to handle because it was more p________. 7．However, it was awkward to use as one of the points of r________was the moving ship itself. 8．On a clear day especially during the summer the sailors could use the sun o________at midday to navigate by. 9．So the Vikings would observe the winds before and during their o________or return journeys. 10．Seamen used