问题
单项选择题
克山病的发病原因之一是由于缺乏（）。
A.磷
B.铁
C.硒
D.锰
E.钙
答案
参考答案：C
解析：克山病的发病原因是由于缺乏硒。
搜题请搜索小程序“爱下问搜题”
克山病的发病原因之一是由于缺乏（）。
A.磷
B.铁
C.硒
D.锰
E.钙
参考答案：C
解析：克山病的发病原因是由于缺乏硒。
| 读一读下面的对话，写名称。 | |||
| A: Where is the teacher's office? B: It's on the first floor. A: Where is the art room? B: It's on the second floor; The music room is on the second floor, too. A: Is the canteen on the first floor? B: Yes, it is. And the washroom is on the first floor, too. A: Do you have a TV room? B: No, we don't. But we have a gym. It's on the second floor.
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