Bruce and Bruno looked worried those days. Their father went to a town far away. Before leaving, he said he would write to them as soon as he found a job there. But two months passed, they did not hear from him. Now they had nothing except the old house and they had no money to buy any food. They thought for a long time. Then they decided to sell the house and look for their father. So one day the two brothers said goodbye to their friends and started to go. They got to the station and bought two tickets.
They were afraid that they would be hungry in the train, so they went to the market to buy something to eat. They saw bananas for the first time. The seller told them the bananas were very delicious, so they bought five kilos and got on the train with them. After a while Bruce brought out a banana and bit(咬) a little. Just at that moment the train went into a tunnel(隧道) and it was dark in the train. He was afraid and called out,“Have you taken a bite of your bananas, Bruno?”
“Not yet.”
“That’s good.”Bruce said, crying,“I did and went blind!”
小题1:Bruce and Bruno were worried because .
A．their father couldn’t find a job in the town..
B．they didn’t hear from their father.
C．Their father left them away.
D．They had no money to buy any food.小题2:They went to the market to .
A．look for their father.
B．buy the tickets.
C．buy something to eat.
D．sell the old house.小题3:Bruce cried because .
A．He couldn’t see anything.
B．The train went into a tunnel.
C．He thought he was blind.
D．He bite the banana.
；C(s)＋
O2(g)===CO (g)
，则
kJ·mol-1，若将含0.5molH2SO4的浓硫酸与含1mol NaOH的溶液混合，放出的热大于57.3 kJ
kJ·mol-1可知，金刚石比石墨稳定
kJ·mol-1，但是浓硫酸溶于水要放热，B正确。由C(石墨)=== C(金刚石)；
kJ·mol-1可知石墨的能量比金刚石低，更稳定，C错误。氢气的标准燃烧热为-285.8 kJ·mol-1指的是1mol氢气燃烧放出的热，D错误。