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问题 选择题

煤燃烧时会排放出一些污染物，这些污染物溶于雨水形成酸雨，造成酸雨的主要物质是（　　）

A．甲烷和一氧化碳

B．二氧化硫和一氧化碳

C．二氧化硫和二氧化氮

D．一氧化碳和二氧化碳

答案

答案：C

阅读理解

Mary has a lot of hobbies. She usually gets up early so she can run before work. She doesn't often have time to skate, but she sometimes goes on Saturdays during the winter. Mary often rides a horse near here home. She sometimes goes after work, but she usually goes horseback riding on Sundays. She loves music. She always goes to choir practice(合唱团训练) on Wednesday evenings and sings in church(教堂) on Sundays. She doesn't have much money, so she seldom(很少) goes to concerts（音乐会） in the city. She seldom watches TV because she likes doing things outside. She usually goes to the gym（体育馆） if it's raining outside. She isn't often alone（独自的） because she has a lot of friends. She sometimes does something alone, but she usually does her hobbies with one of her friends. She's a happy woman!

小题1:Mary often gets up early because she wants to _______.

A．have breakfast

B．clean her room

C．run

D．skate小题2:Mary usually goes horseback riding on _______.

A．Wednesday

B．Sunday

C．Saturday

D．workday小题3:Mary seldom ________ because she likes doing things outside.

A．goes to concerts

B．goes to the gym

C．goes to church

D．watches TV小题4:Mary seldom goes to concerts because she ______

A．isn’t rich(富有的)

B．is busy

C．doesn’t like music

D．has many friends小题5:Which of the following is not true?

A．Mary is often alone.

B．Mary likes running.

C．Mary has lots of friends.

D．Mary is a happy woman.
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问答题

【背景资料】
某城市道路工程，基层采用水泥稳定土，施工中的部分技术指标如下：
(1)选用初凝时间3h以下的32.5级水泥；
(2)水泥稳定土中的中粒土做基层时，水泥剂量不宜超过10%；
(3)施工最低气温为-5℃；
(4)基层保湿养生不宜小于3h；
(5)基层的压实厚度最多不超过30 cm。
在该道路工程面层施工时，已进入冬期，施工项目经理部为此提出了应对措施。
【问题】1. 1．水泥稳定土路基层宜在哪个季节施工
2．水泥稳定土路基层施工中的技术指标有哪些不妥之处，并改正。
3．当该道路面层采用水泥混凝土面层时，该项目经理部做到哪些应对各期施工的措施
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