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牛津版高二英语必修5unit3教案

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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 ur

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 arding 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。此题必须正确理解设问的意思

3. If ne high tide urs at 1: 00 a. . , the next high

tide at the sae pint will ur 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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