读图判断图中A地在B地的什么方向( )
A.正南方向
B.正北方向
C.西北方向
D.西南方
根据以上分析,A在南极,B在北极;再根据A和B所处的经度位置,A肯定位于B的西南方.
故选:D
试述单根神经纤维动作电位和神经干复合动作电位有何区别?并分析其原因。
句式改写。
1. Are the children reading English in the classroom? (肯定回答)
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2. There are some potatoes in the fridge. (改为否定句)
3. He can help us raise the money. (改为一般疑问句)
4. Jack is flying a kite at the moment. (用every spring 改写句子)
5. her, is, he, showing, good, something (连词成句)