题目

冰的摩尔质量为，冰的密度为，那么冰分子的直径大约为 。 答案：One day,  John read an advertisement in a newspaper．It said, "Wanted．The best salesman in the world．" John thought he was a great salesman and went to ask for the job．" "I' m the best salesman in the world," he said to the manager．"Give me the job．" "You must prove you're the best," the manager said． "OK I will," John said． "Good．" The manager took several boxes of sweets out of his desk．"Last week I bought a thousand boxes of sweets．If yon can sell them all before the end of the week, yon can have the job, " said the manager． "That's easy, "John said．He took the boxes of sweets and left the office． Every day and all day he went from shop to shop, trying to sell the sweets．But he couldn't sell one．The sweets were too bad for him to sell．At the end of the week he went back to the manager．"I'm sorry, sir," he said, "I was wrong about myself．I'm not the best salesman in the world, but I know who is．" "Oh" said the manager．"Who?" "The person who sold you a thousand boxes of the sweets．" 1．The manager told John             ． A．he could start work at once B．he was the best salesman in the world C．he wasn't a good salesman D．he must show he was the best salesman in the world 2．John could get the job if                  ． A．he sold a thousand boxes of sweets B．he gave a way a thousand boxes of sweets C．he sent the manager a thousand boxes of sweets D．he bought a thousand boxes of sweets  from the manager 3．Choose the right order (顺序) of the story． (1) John went to ask for the job． (2) John told the manager who the best salesman really was． (3) John read an advertisement in a newspaper． (4) John went to sell the sweets． A．(1) (2) (3) (4)                                         B．(4) (3) (2) (1) C．(3) (1) (4) (2)                                          D．(3) (4) (1) (2) 4．From this story we can know that              ． A．John didn't get the job                          B．John was a good seller C．the manager was a good seller             D．the advertisement was a good one 5．John couldn't sell the sweets because                     ． A．he was not a good salesman                B．the sweets were too bad C．he wanted to send them to his friends        D．nobody liked sweets