50．Srivastava's opinion is different from that of some other scientists in that ________.

　　A．the long－term effect of the oil spill remains to be seen

　　B．the effect of the oil spill is quite clear and it needs no study

　　C．the hatching of turtles is free from the effect of the oil spill

　　D．the oil spill does lead to a higher mortality rate of the hatchlings

　　答案　B　[细节理解题。根据倒数第二段可知，Srivasrava认为石油泄漏对于海龟的孵化没有影响，这一点与一些科学家的看法相反。]

　　51．The best title for the passage should be “ ________”．

　　A．The mortality rate of the hatchlings of turtles

　　B．Oil spill spoils thousands of turtle eggs

　　C．How turtles survive the oil spill

　　D．Effect of oil spill on the environment

　　答案　B　[主旨大意题。浏览全文不难看出本文主要是围绕石油泄漏对海龟孵化的影响来讨论的，因此选B。]

　　E

　　One winter evening，a storekeeper was going to close up his shop.Suddenly he saw Seth，a lazy，good­for­nothing fellow grab a pound of fresh butter and concealed it in his hat. No sooner had the storekeeper seen the act than he hit upon exactly the right revenge.He would punish the thief，and satisfy his own appetite for fun.

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