夏季施工期间如最高气温超过30℃，必须在1h内将水泥砂浆用完。( )

阅读理解。

     Two farmers were on their way home one evening after a hard day's work. Both of them were

tired. They happened to look up at the sky and saw a black cloud overhead.

      "Ah! ". said one farmer, " tomorrow we shall have rain and the rice will grow well. " The second

answered, " Nonsense, the rain will only kill the crops. " So they began to quarrel. Just then a third

farmer came along and asked them why they were quarreling. Both farmers explained about the black

cloud.

      "What cloud?" asked the third farmer. They all looked at the sky. The cloud was no longer there.    

1. The two farmers were _______.      

A. going home    

B. going to the field  

C. going to work  

D. going to see their friend

2. The two farmers _______ on that day.     

A. had a holiday      

B. didn't work

C. worked hard      

D. wanted to quarrel with each other

3. When there is a black block of cloud in the sky, _______.       

A. it will rain soon    

B. it will be fine

C. it will get hot      

D. the sun is shining brightly

4. The two farmers fought in words because _______.       

A. they were hungry

B. it rained

C. one said the rain would do good to the crops and the other didn't think so

D. they both hoped for rain

5. The third farmer came along and said to the other two. He _______.  

A. wanted to make friends with them

B. joined them in the quarrel

C. wanted to know why they were quarreling

D. had nothing to do

下列哪种动物不是变温动物 [ ]

A．金鱼

B．青蛙

C．眼镜蛇

D．北极熊

冻融作用

闭式循环冷却水