题目内容
The word "thorny"(Para. 1) most probably means "______".
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进度安排的常用图形描述方法有Gantt图和PERT图。Gantt图不能清晰地描述(18)；PERT图可以给出哪些任务完成后才能开始另一些任务。下图所示的PERT图中，事件6的最晚开始时刻是(19)。
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A．ORDER BY供应商B．ORDER BY零件号C．GROUP BY供应商D．GROUP BY零件号
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文： People usually sing because they like music or because they feel happy. They express their happiness by singing. When a bird sings, however, its song usually means much more than that a bird is in a good temper. Birds have many reasons for singing. They sing to give information.
Their songs are their language. Love songs are sung by male birds. They sing when they want to attract a female bird. It is their way of saying that they are looking for a wife. Birds also sing to tell other birds to keep away. To a bird, his tree, or even a branch of tree is his home. He does not want strangers to come near his home. So he sings to warn them. If a bird can not sing well, he usually has some other means of giving important information. Stone birds dance, spread out their tails, or make other signs. There is also a special kind of bird which builds a small garden of stones and flowers to attract a female bird.
(27)
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