【正文】 on’t allow you to bring them across their borders. 5. Stretch your legs. More and more travelers suffer from blood clots caused by sitting too long in tight spaces. You can help prevent this problem by doing stretches in your seat taking short walks every hour. 6. Entertain yourself. A long trip can either mean hours of boredom or an exciting adventure. Plan ahead to keep yourself busy with books， magazines and portable CD player. Just don’t fet to bring extra batteries. Research airlines before you book your reservations. For just a few dollars more， some airlines offer personal entertainment systems. Singapore Air gives you nearly 70 choices of movies， music channels, and other entertainment！ With a little planning ahead， you’ll be able to sit back and enjoy the ride. 64. It is advised by the writer in this passage to _____ for your flight. A. pack all the things you will reed B. leave your important documents behind C. carry some fresh foods with you D. take some books, magazines and CD players 65. Which of the following tips isn’t mentioned in this passage？ A. Researching airlines before reservations. B. Staying still during the whole flight. C. Carrying some water and essential items. D. Making a list of the things you need. 66. The underlined phrase “e by” in tip 3 probably means _____. A. receive by chance B. obtain by effort C. pass by D. offer in satisfaction 67. We can conclude from this passage that _____. A. you will get sick during the long flight hours B. old items are not allowed to bring back on the way home C. you are not allowed to carry things as freely as you want D. you can also board the plane without your passport D It was like a door that had been left open invitingly. Bob stepped through, and immediately regretted it. He was standing in a dim lowceilinged cave, the walls carved out of solid ice. There were five children there, huddling（擁抱） together in corner, their eyes fixed hopefully on his. They were dressed exactly as he was, in pale sheepskin jackets and trousers, with matching boots, and caps pulled down over their ears. All of them were in their mid teens, and their faces, pinched（皺縮） as much by fear as with cold, seemed strangely familiar, as though he had known them all his life. A girl with intense dark eyes nodded towards the end of the room. When he failed to respond, she nodded again, more urgently than before, her lips forming words soundlessly. He saw then what he should have seen earlier, a second door set low in the end wall. It was much smaller and far less noticeable than the first, yet he felt drawn to it just the same. Or was he merely being encouraged by his silent panions? Another of them, a timid boy, gave him a smile of encouragement, which was instantly reflected in all the other faces. He found it difficult to resist, as if this, after all, was why he was here to help them out in their mysterious adventure. And under the pressure of their bined request, he bent down and crawled through the low opening. This time he emerged onto a windswept ledge（巖壁） . Above him, dark grey clouds racked across an even grey sky Below—far below—lay a deserted valley heaped with slabs（厚片） of ice. 68. When Bob entered the cave, he knew that he _____. A. was wele B. was unwele C. had frightened the children inside D. couldn’t leave the cave 69. The children huddled together because they were _____. A. of one family B. trying to keep warm C. afraid of Bob D. determined to stay together 70. The girl nodded towards the end of the cave because she _____. A. didn’t dare to speak to Bob B. couldn’t speak Bob’s language C. wanted Bob to know their situation D. was too hungry to speak 71. Bob went through the second door because _____. A. he found it too cold in the cave B. the timid boy forced him to do so C. it led to a mysterious unknown place D. the children wanted him to do so E All through history， explorers have led the way for people to move into new places. Today’s explorers are responsible for leading the way into space. The first person in space was Yuri Gagarin from the Union of Soviet Socialist Republics (USSR). Mr. Gagarin was sent into the space on April 12,