在开车时为什么要建立余热回收系统和甲醇回收塔的循环？

阅读理解。

     My friend Matt and I arrived at the Activity Centre on Friday evening. The accommodation wasn't

wonderful, but we had everything we needed (beds, blankets, food), and we were pleased to be out of the

city and in the fresh air. 　　

     On Saturday morning we met the other ten members of our group. Cameron had come along with

two friends, Kevin and Simon, while sisters Carole and Lynn had come with Amanda. There were some

other members I didn't know. We had come from different places and none of us knew the area. 　　

     We knew we were going to spend the weekend outdoors, but none of us was sure exactly how.

Half of us spent the morning caving while the others went rock-climbing and then we changed at

lunchtime. Matt and I went to the caves (岩洞) first. Climbing out was harder than going in, but after a

good deal of pushing, we were out at last. Though we were covered with mud, we were pleased and

excited by what we'd done.

1. The writer spent the Saturday morning _____. [ ]

A. rock-climbing　　　

B. sleeping　　

C. meeting friends　　

D. caving

2. There were _____ members in all in the writer's group. 　 [ ]

A. 6　　

B. 8　　　

C. 10　　

D. 12

3. We can learn from the passage that _____. [ ]

A. some of the group had been there before

B. the group had done rock-climbing many times

C. some of the group already knew each other

D. group all came from the same city

4. The write thought her weekend was _____. [ ]

A. interesting

B. relaxing

C. frightening　　

D. unpleasant

5. This passage mainly talks about _____. [ ]

A. the writer's friends at the Activity Centre

B. the writer's experience at the Activity Centre

C. outdoor sports at the Activity Centre

D. how to go rock-climbing and caving

血栓性疾病早期宜用

A．奎尼丁
B．利多卡因
C．普萘洛尔
D．维拉帕米
E．阿托品

（）以创作“葛川江系列”小说而著称。

普通减水剂宜用于日最低气温（）以上施工的砼，不宜单独用于蒸养砼。

A、-5℃

B、0℃

C、5℃

（）是最常见、最简单也是最为古老的一种楼梯。

A、钢木梯

B、直梯

C、木楼梯

D、石楼梯