问题
不定项选择题
X和Y的原子序数都小于18，两者能组成化合物X2Y3，已知X的原子序数为n，则Y的原子序数不可能是[ ]
A、n＋11
B、n－5
C、n＋3
D、n－6
答案
D
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X和Y的原子序数都小于18，两者能组成化合物X2Y3，已知X的原子序数为n，则Y的原子序数不可能是[ ]
A、n＋11
B、n－5
C、n＋3
D、n－6
D
Questions 23-30
· You will hear people from the National Food Council complaining to retailers about the high prices they are charging for food products and household goods. They complain that the shops have marked up wholesale prices far too much.
· For each question (23-30), mark one letter (A, B or C) for the correct answer.
· After you have listened once, replay the recording.
The meeting is being held to discuss
A．
| A. an increase in the price of food. |
B．
| B. the high price of tinned food. |
C．
| C. certain shops in the district. |