问题
单项选择题
生精小管内最先形成的单倍体细胞是（）。
A.精原细胞
B.初级精母细胞
C.次级精母细胞
D.精子细胞
答案
参考答案：C
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生精小管内最先形成的单倍体细胞是（）。
A.精原细胞
B.初级精母细胞
C.次级精母细胞
D.精子细胞
参考答案：C
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| Some years ago I worked with people on public welfare. I believed that everybody had the ability to be 1 and all we have to do was to make them start working. The first thing I said to them was, "I would like to know what your 2 are." Everyone looked at me as if I were 3 . One woman said "I don't know what you can 4 with dreams. The rats are eating up my kids." I said. "That's terrible. You are very much 5 with the rats and your kids. How can we help?" " I could use a new screen door(纱门)because there are 6 in the old." I asked, "Is there anybody knowing 7 to fix it?" A man said, "Long ago I used to do things like that but now I have a bad back, but I'll 8 ." I gave him some money to do that. The next week, when the group was 9 , I asked the woman, "Well, is your 10 door fixed?" "Oh, yes," she said. "Then we can start dreaming, right?" She 11 at me. I asked the man, "How do you feel?" He said, "Well, it's funny that I'm beginning to feel a lot 12 ." These seemingly small 13 allowed the group to see that dreams were not stupid. One woman 14 that she wanted to be a secretary. I said, " What 15 in your way?" She answered, "I have six kids, and no one can 16 them while I'm away." I asked "Who would help this woman while she gets some 17 at school?" Another woman said "I got kids, too, but I could do that." So the woman went to school. In 12 weeks these people were 18 public welfare. The woman who 19 the children became a licensed foster care (代别人照看孩子)person. The man became a handyman. I've not only done that 20 , I've done it many times. | ||||
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