问题
单项选择题
隧道施工应采取综合防尘措施，并应配备专用检测设备及仪器，隧道内存在矽尘的作业场所，（）应至少取样分析空气成分一次。
A.每周
B.每旬
C.每月
D.每季
答案
参考答案：C
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隧道施工应采取综合防尘措施，并应配备专用检测设备及仪器，隧道内存在矽尘的作业场所，（）应至少取样分析空气成分一次。
A.每周
B.每旬
C.每月
D.每季
参考答案：C
| Read Mary's questions and choose Tom's answers. Write the correct letters in the boxes. 根据问题，选择正确答案。 |
| 1. Mary: Who is Steven? Tom: |
[ ] |
| A. Steven is very strong. B. Steven works in a department store. C. Steven is my good friend. |
| 2. Mary: How often do you take a shower? Tom: |
[ ] |
| A. I like to play ping-pong. B. Three times a week. C. Basketball is hard. |
| 3. Mary: Would you like to have a cup of coffee? Tom: |
[ ] |
| A. I like coffee. B. Coffee and tea are different. C. Yes, please. |
| 4. Mary: Is playing soccer your favourite sport? Tom: |
[ ] |
| A.Yes, it isn't. B. Yes, I like it best. C. No, it is. |
| 5. Mary: Did you have fun today? Tom: |
[ ] |
| A.Yes, we don't. B. Yes, we did. C. Yes, we do. |