D.Because there is a model in the animals' brains.
解析:推理判断题。由第3段第1句中的because baboons are one of the best animal models for the human brain可知答案。
答案:A
4.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 longlasting effects on the brain systems
D.people have long known that repeated use of the drug damages brain cells
解析:猜测词义题。由第4段中的even very occasional use can have longlasting effects on many different brain systems可知:this指摇头丸对大脑造成的永久性伤害。
答案:C
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