A．Because their brain is similar to human being’s．

　　B．Because these animals usually take drugs．

　　C．Because these animals will soon get well after the experiment．

　　D．Because there is a model in the animals’ brains．

　　66．The underlined word “This” in the last paragraph probably means that ______．

　　A．Leah died after a single Ecstasy tablet in 1995

　　B．taking drug has the same symptoms as smoking

　　C．occasional use of the drug can have long-lasting effects on the brain systems

　　D．people have long known that repeated use of the drug damages brain cellsD

　　My students often tell me that they don’t have “enough time” to do all their schoolwork．

　　My reply is often a brief “You have as much time as the president．” I usually carry on a bit about there being twenty-four hours in the day for everyone, and suggest that “not enough time” is not an acceptable explanation of not getting something done．

　　Once in graduate school, I tried to prove to one of my professors by saying that I was working hard．His answer to me was, “That’s irrelevant （无关的）．What’s important is the quality of your work．” Since then I have had time to think carefully about the “hard worker” dodge （诀窍）, and I have come to some conclusions — all relevant to the problem of how much time we have．

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