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关系代数中，运算的三要素是指运算对象、运算符和______。
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Task 1Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 to 40. For each question or statement there are 4 choices marked A), B), C) and D). You should make the correct choice and mark the corresponding letter on the Answer Sheet with a single line through the centre. In many countries such as France, Greece, and Japan, it is often more difficult for students to pass the college entrance exams than to do the course work when they are actually in college and students who don’t have much money are at a disadvantage. Students prepare for these tests for years in advance. Often, students attend a private school at night to get ready for them. These private schools are usually expensive. If their families don’t have much money, students can’t attend and they might not pass the entrance exams without this extra preparation. In contrast, students can easily get into an American or Canadian college--at least more easily than in other countries. American students take an entrance exam called the S. A. T (the Scholastic Aptitude Test 学习能力测验). However, colleges do not consider only S. A.T. scores. They also consider a student’s grades and activities throughout high school. A student who has done well in high school will probably get into college. What happens when a student finally enters a college or university Students in China, Korea or Japan might find their college studies easier than high school work. On the other hand, when American or Canadian students begin college, many of them discover that they need to work very hard and study seriously for the first time in their lives especially if they plan to go to graduate school. From the first paragraph we can see that before entering college, students must ______.
For more than 50 years, AT&T has been a proud supporter of the arts. In fact, over the past decade alone, AT&T: On Stage has sponsored more than 60 world premieres of new plays or musicals in the United States, Canada and United Kingdom. Today, that tradition of presenting exciting new work continues with the opening of not one, but two plays on two of the most respected stages in New York City. On February 8th, TEN UNKNOWNS, the new play by Jon Robin Baitz, begins performances at Lincoln Center Theater, On February 16th, LOBBY HERO, the new play by Kebbeth Lonergan, premieres at Playwrights Korizons. Two highly respected playwrights. Two highly anticipated plays. Two nights in the theater that got their start with help of AT&T: On Stage. Who has been a supporter of the arts
中华民国成立后，蒋介石将“巡捕”和“巡警”改为警察。 ( )
For more than 50 years, AT&T has been a proud supporter of the arts. In fact, over the past decade alone, AT&T: On Stage has sponsored more than 60 world premieres of new plays or musicals in the United States, Canada and United Kingdom. Today, that tradition of presenting exciting new work continues with the opening of not one, but two plays on two of the most respected stages in New York City. On February 8th, TEN UNKNOWNS, the new play by Jon Robin Baitz, begins performances at Lincoln Center Theater, On February 16th, LOBBY HERO, the new play by Kebbeth Lonergan, premieres at Playwrights Korizons. Two highly respected playwrights. Two highly anticipated plays. Two nights in the theater that got their start with help of AT&T: On Stage. How many world premieres of new plays or musicals has AT&T: On Stage sponsored over the past decade______ world premieres.
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