问题
单项选择题
起搏冲动发生的细胞是：
A．结细胞
B．移行细胞
C．蒲肯野纤维
D．神经细胞
E．心肌细胞
答案
参考答案：A
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起搏冲动发生的细胞是：
A．结细胞
B．移行细胞
C．蒲肯野纤维
D．神经细胞
E．心肌细胞
参考答案：A
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| As students we should learn to help others. There is a special 1 for us to help others at our school. Last year we went to an old man's 2 , and we sangsongs, danced and didhousework for 3 . The old people were very 4 . And on that day we felt very excited 5 we can try our best to do good things forpeople. I think we should do things like thatmore often. For example, we should 6 primary schools and help the teachers 7 young students .I want to be a 8 when I'molder, so it would be a great experience for me. 9 students would like to do other jobs. Forexample, my friend Liu Lei wants to 10 for a newspaper. She usually goes to the newspaperoffice once a week.  | ||||
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