题目内容
若每一条指令都可以分解为取指、分析和执行三步。已知取指时间t取指＝4△t，分析时间t分析＝3△t，执行时间t执行＝5△t。如果按串行方式执行完100条指令需要（）△t。如果按照流水线方式执行，执行完100条指令需要（）△t。 如果按照流水线方式执行，执行完100条指令需要（）△t。
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试述土地集约利用的概念和衡量土地集约利用程度的标准。
Passage Four Laura and Anthony Valois are a young New York couple who have been trying in vain to have their first child. Several years ago, Belinda Ramirez read an Internet adoption listing and quickly contacted them from her home in Texas , telling them they could adopt her unborn baby. Excited, Laura and Anthony spent weeks communicating with Ramirez and got regular updates on her pregnancy. Before long, Ramirez began to ask them for financial support. That took the Valoises by surprise. But they were willing to do a lot to ensure a smooth birth. They sent more than $1, 000 to Ramirez over several months. Laura and Anthony finally drove to Texas so they could be on hand for the birth. But once they arrived, Ramirez avoided their daily phone calls. After three weeks, the couple drove back to New Yorkempty-handed and emotionally crushed. They later learned Ramirez had been cheating about ten other people for such things as Wal-mart gift cards in states ranging from California to Ohio to Florida. From start to finish, it was a scam. In fact, Ramirez was never even pregnant. She was sentenced to 24 months in prison as she deserved. " When you find out you can’t have children, it’s just depressing, " Laura Valois told a Texas TV station. " But when somebody intentionally does this to you, it’s 15 times worse. \ What was depressing for the couple according to Laura
脑神经主要支配头面部器官的感觉和运动。脊神经主要支配身体和四肢的感觉、运动和反射。（）
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