The researcher believes the brain needs at least ten days to recover after a long trip. He says airline workers told him their ability to remember got worse after working on planes for about four years. Other studies have shown that increased feelings of stress can cause a loss of cells in the part of the brain that controls memory.

　　Scientists say more tests are needed to study the effects of jet lag on the brain. They want to find out if too much jet lag could permanently (永久性的) affect memory.

　　67. According to the text, jet lag .

　　A. can cause difficulties in speaking

　　B. can make people feel tired for a few weeks

　　C. can be only found in flight attendants

　　D. can be caused by flying over several time zones

　　68. It can be inferred from the text that .

　　A. the conclusion is refused by many scientists

　　B. scientists fear that this research is not done properly

　　C. the scientific conclusion needs the support from many tests

　　D. every women who were examined in the research were mot healthy

　　69. From the result of the research we can see that .

　　A. the women who have longer rest at home show better memory

　　B. the women who fly in short time have smaller right temporal lobes

　　C. the women who have longer flights fail the memory test

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