单选题9. Mary's classmates are worried about Mary because no one was aware where she had gone.

单选题22. Passengers should allow for ______ travel time to the airport in rush-hour traffic.

单选题21. We could do nothing but ______ till he came back.

单选题 Being out of work

单选题. Question 13 to 15 are based on the second conversation.5.

单选题48. Young adults ______ older people are more likely to prefer pop songs.

单选题23. She ______ his anger though he did not say a word to her.

单选题18. Many young people nowadays make ______ a rule to buy flowers and chocolate for their lovers on Valentine's Day.

单选题26. The only thing now standing ______ of further progress is lack of money.

单选题9. It is only in the most difficult circumstances ______ a man's abilities are fully tested.

单选题19. If you don't agree with me, ______.

单选题16. Managing is the process of getting things ______ by and through others.

单选题37. I know nothing about John ______ he is a teacher at some university.

单选题23. There were no tickets ______ for Friday's performance.

单选题12. He told us the stories and the writers ______ interested him.

单选题21. I didn't buy a car yesterday for the simple reason ______ it was too expensive.

单选题 I have no ______ to the plan

单选题 As for the quality of this model of computers

单选题38. Theory is based on practice and ______ serves and guides practice.

单选题. It is hard to imagine life without Arabic numerals (数字). No other number system ever invented has a simple way to write a number like 1984. In Roman numerals, it comes out like this: MCMLXXXIV. Imagine how difficult it would be for a school pupil to remember it! The Arabs, however, call their numbers "Indian numerals". This is probably because they got the original idea a long time ago from India. There were no printed newspapers or scientific magazines then, so mathematics traveled along the same routes that silk did, as businessmen sold and bought goods. The Arabs took the new numbers and made improvements that quickly led to advances in technology. The achievement of Arabic technology can be seen from a passage in a 10th-century book about an Arabic city: "The neighboring country showed the results of careful work in agriculture, trade, and industry. Rice and many other plants were grown in fields with water supplied by Arab engineers. The city included 900 public baths, stone-covered streets, fountains, and beautiful buildings." At this time, London was a small town with dirty streets, and Berlin was a farming village. In fact, cities outside the Arab world did not reach the same level of social development until centuries later.1. This passage tells us that the Arabs were a people ______.