牛津版高二英语必修5unit3教案
教后记：
高考链接—拓展阅读
Tides(潮汐)are created ainl b the pull f the n n the earth. The n's pull causes w ater in the ceans t be a little deeper at a pint clset t the n and als at a pint farthest fr the n n the ppsite side f the earth. These tw tidal"Waves"fllw the apparent(明显的) veent f the n arund the earth and strie nearl ever cast line at in- tervals f abut twelve hurs and twent-five inutes. After reaching a high pint, the water level ges dwn graduall fr a little re than six hurs and then begins t rise tward a new high pint. Hence, st cast lines have tw tides a da, and the tides ccur fift inutes later each da. Differences in the cast line and in channels in the cean btt a change the ties t hat the tidal wave reaches different pints alng the sae cast line. Tne difference in water level between high and lw tide varies fr da t da accrding t the relative psitins f the sun and the n because the sun als exerts a pull n the earth, althugh it is nl abut half as strng as the pull f the n. When the sun and the n are pulling alng the sae line, the tides rise higher, and when the pull at fight angles t ne anther, the tide is lwer. The fratin f the cast line and variatins(变化)in the weather are additinal factrs which can affect the height f tides. Se sectins f the cast are shaped in such a wa as t cause uch higher tides than are experienced in ther areas. A strng wind blwing tward the shre a als cause tides t be hi gher.
1. The height f the tide is affected b all f the fllwing except_________.
A. the psitin f the sun
B. the directin f the wind
C. variatins in the cast line
D. channels in the sea btt
答案：D 指导：潮汐的高度受太阳、风向和海岸线差异的影响，海沟只影响潮汐的'时间。由文中Differences．．．in channels in the cean btt a change the tie.可知。
2. If the pull f the sun equaled the pull f the n, tides wuld_________.
A. seties be higher than the are nw
B. be the sae height as the are nw
C. n lnger be affected b the wind
D. be f equal height all the tie
答案：A 指导：太阳对地球的吸引力只有月亮的一半(．．．it is nl abut half as strng as the pull f the n)如果相同并作用在一个方向上，潮汐会比目前高。本题必须正确理解设问的意思
3. If ne high tide ccurs at 1: 00 a. . , the next high tide at the sae pint will ccur at abut_________.
A. 1: 25 a.. the sae da
B. 1: 00 p.. the sae da
C. 1: 25 p.. the sae da
D. 1:50 a.. the next da
答案：C 指导：潮汐12小时一次，每24小时向后延迟50分钟，题干中所给定的时间是12小时间段，故应是25分钟。
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