问题
单项选择题
过滤式自救器仅能防护一氧化碳一种气体。适用于灾区内空气浓度不低于18%和一氧化碳浓度不高于（）。
A、1.0%
B、1.5%
C、2.0%
答案
参考答案：B
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过滤式自救器仅能防护一氧化碳一种气体。适用于灾区内空气浓度不低于18%和一氧化碳浓度不高于（）。
A、1.0%
B、1.5%
C、2.0%
参考答案：B
| 完形填空。 | |||
| This is our classroom. It’s not big, but it’s very nice. The walls are ________ (1)and the desks and chairs are new. On one of the walls, there is a ________ (2)and we can find Beijing, Shanghai and Hangzhou on it. There are some ________ (3)on the teacher’s desk. They are for our ________ (4), Miss Gao. She is a good teacher and we all like her. I’m on ________ (5)today. I come to school early. I help my teacher ________ (6)her books and pictures on her ________ (7). I tell her everyone is here. But I’m ________ (8), Liu Mei is not at ________ (9). I don’t know ________ (10)she is. But I think she’s at home. | |||
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