正十六烷与纯a-甲基萘以55：45混合，则该混合液的十六烷值（）A、45 B、55
题型：单项选择题
问题：
正十六烷与纯a-甲基萘以55：45混合，则该混合液的十六烷值（）
A、45
B、55
C、100
题型：单项选择题
Bill Javis took over our village news-agency at a time of life when most of us only want to relax. He just thought he would like something but not too much to do, and the news-agency was ready-made. The business produced little enough for him, but Bill was a man who only wanted the simplicity (简单)and order (秩序) and regularity (规律) of the job. He had been a long-serving sailor, and all his life had done everything by the clock.
Every day he opened his shop at six a.m. to catch the early trade (买卖); the papers arrived on his door-step before that. Many of Bill’s customers were city workers, and the shop was convenient for the station（邮局）. Business was tailing off by 10 o’clock, so at eleven sharp Bill closed for lunch. It was hard luck on anybody who wanted a paper or magazine in the afternoon, for most likely Bill would be down on the river bank, fishing, and his nearest competitor was five kilometers away. Sometime in the afternoon, the evening paper landed on the doormat, and at 4 o’clock Bill reopened. The evening rush lasted till seven, and it was worthwhile.
He lived in a flat above the shop, alone. Except in the very bad weather, you always knew where to find him in the afternoon, as I have said. Once, on a sunny afternoon, I walked home along the river bank from a shopping trip to the village. By my watch it was three minutes past four, so I was astonished to see Bill sitting there on his little chair with a line in the water. He had had no luck, I could see, but he was making no effort to move.
“What’s wrong, Bill?” I called out from the path.
For answer, he put a hand in his jacket and took out a big, golden object. For a moment I had no ide
a what it could be, and then it suddenly went off with a noise like a fire engine. Stopping the bell, Bill held the thing up and called back, “Ten to four, you see, and this is dead right.” I had never known anyone carrying a brass alarm clock (闹表) round with him before.
小题1:Bill opened the shop so early in the day because _______．
A．he liked to do as much as possible before he went to work
B．the shop had to be open when the morning papers came
C．he was never sure of 
the time
D．it was then that he did a lot of business小题2:You might say “hard luck” to someone who _______．
A．has just heard some very good news
B．is less fortunate than he or she ought to be
C．puts great effort into whatever he or she tries
D．fails through his or her own fault entirely小题3:On that sunny afternoon, the writer was surprised when he saw Bill because _______．
A．he thought it was late for Bill to be still fishing
B．he thought Bill was ill, since he was not moving at all
C．Bill had not caught anything, and that seemed strange
D．Bill stayed in his flat小题4:From the information given in the passage, who or what do you think was wrong?
A．The bell was; it must have gone off at the wrong time.
B．Bill was; he had dropped off to sleep.
C．The writer’s watch was fast.
D．Bill’s clock was wrong; it was very old.