武漢大學2006年考博英語

武漢大學真題2006年

(總分100, 考試時間90分鐘)

Part Ⅰ Reading Comprehension

Directions: There are 5 reading passages inthis part. Each passage is followed by some questions or unfinished statements.For each of them there are four choices marked A, B, C, and D. You shoulddecide on the best choice and mark your answer on the ANSWER SHEET byblackening the corresponding letter in the brackets.

Tides are created mainly by the pull of the moon on the earth. Themoon's pull causes water in the oceans to be a little deeper at a point closestto the moon and also at a point farthest from the moon, on the opposite side ofthe earth. These two tidal "waves" follow the apparent movement ofthe moon around the earth strike nearly every coastline at intervals of abouttwelve hours and twenty-five minutes. After reaching a high point, the water level goes down gradually for a little more thansix hours and then begins to rise toward a new high point. Hence, most coastlines have twotides a day, and the tides occur fifty minutes later each day. Differences inthe coastline and in channels in the ocean bottom may change the time that thetidal wave reaches different points along the same coastline. The difference inwater level between high and low tide varies from day to day according to therelative positions of the sun and the moon because the sun also exerts a pullon the earth, although it is only about half as strong as the pull of the moon.When the sun and the moon are pulling along the same line, the tides risehigher, and when they pull at right angles to one another, the tide is lower.The formation of the coastline and variations in the weather are additionalfactors which can affect the height of tides. Some sections of the coast areshaped in such a way as to cause much higher tides than are experienced inother areas. A strong wind blowing toward the shore may also cause tides to behigher.

1.Which of the following may be concluded from the information presented in thepassage?
A Some coastlines do not have two tides eachday.
B Tides usually rise to the same level dayafter day.
C Tides are not affected by the shape of acoastline.