死亡的标志是 ( )。
A. 脑死亡
B. 脑电波零电位
C. 瞳孔散大
D. 呼吸停止、心跳停止
疾病发展的典型经过包括潜伏期、_________、临床症状明显期和________期。
Why were the parents unhappy with theirlifestyle?
A. It was too routine.
B. They didn't like their jobs.
C. Their children were unhappy.
D. They couldn't save enough money.
2. What was their children's first reaction tothe idea?
A. They didn't care.
B. They were shocked.
C. They were negative.
D. They were supportive.
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