以下哪条不是脑死亡的诊断标准（）
A.无自主活动
B.脊髓反射消失
C.脑干反射消失
D.自主呼吸停止
E.无脑电活动
参考答案：B
我国疆域四个端点中，位于北温带的有:
①北端 ②南端 ③东端 ④西端
A．①
B．①③④
C．①③
D．①④
用所给单词的适当形式填空。
1. If I _____(be) a scientist, I _____ (will) combine a sheep and a poatato.
2. It’s snowing today. Jenny had beter _____ (not go) out.
3. Have you ever studied _____ (clone)?
4. You and your sister look the same. I can hardly _____ (identical) you two.
5. Sam’s grandfather has been _____ (die) for many years.
