问题
单项选择题
产生雄激素结合蛋白的细胞是
A．生精细胞
B．精原细胞
C．精子细胞
D．睾丸支持细胞
E．睾丸间质细胞
答案
参考答案：D
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产生雄激素结合蛋白的细胞是
A．生精细胞
B．精原细胞
C．精子细胞
D．睾丸支持细胞
E．睾丸间质细胞
参考答案：D
Do you often think of your parents? You may say, “Of course, I 16 . I buy a present for my  mother on Mother’s Day and on Father’s day I give my father 17 , too.” But what about the other days of the year?I have a friend whose parents live in another city. One day I went to see her. We had a nice talk. Then she wanted to 18 . So she  dialed the number, but then she put down the phone. After about fifteen 19 , she dialed t he number again, “Hi, Mom…”Later I asked, “ 20 did you dial the number twice?” She smiled, “My parents are old and 21 . They can’t get close to the telephone quickly. I always do so when I call them. I just want to give them 22 time to answer the call. ” My friend is a good girl. She is 23 thinking about her parents. You also want to be a 24 child, right? Please remember to 25 your parents in every situation, not just on some important days.
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