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【简答题】
（12分）．现有 m g某气体，它由双原子分子构成，它的摩尔质量为 M g·mol － 1 。若阿伏加德罗常数用 N A 表示，则： (1)该气体的物质的量为______ __ (2)该气体所含原子总数为 个。 利用“化学计量在实验中的应用”的相关知识进行填空 (3)含有6.02×10 23 个氧原子的H 2 SO 4 的物质的量是_______ (4)与标准状况下 V LCO 2 所含氧原子数目相同的水的质量是_____ __ (5)在一定的温度和压强下，1体积X 2 （g）跟3体积Y 2 （g）化合生成2体积化合物，则该化合物的化学式是__________ _____ (6)三种正盐的混合溶液中含有0.2 mol Na + 、0 .25 mol M g 2+ 、0.4 mol Cl － 、SO 4 2— ，则n（SO 4 2— ）为___ ________
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【单选题】He had a stomachache ________ he ate something bad this morning.
A.
or
B.
if
C.
so
D.
because
【单选题】The young man hurried back because ______.
A.
he remembered he had left something on the train
B.
he realized that he had got off at the wrong station
C.
a passenger was calling him back by his name
D.
a passenger shouted to him that he had left something behind
【简答题】A．He had something more important to do. B．He had no passion for it. C．There was power cut-off in his area. D．His TV set had no signal.
【单选题】By accident, he _______he had done something wrong and that he hadn’t been prison for a few weeks.
A.
let out
B.
made out
C.
made sure
D.
took care
【单选题】Which of the following sentences is the meaning of"Tom was to have gone to New York but he had something urgent to deal with"?
A.
Tom would go to New York but he had something urgent to deal with.
B.
Tom had intended to go to New York but he had something urgent to deal with.
C.
Tom was going to New York but he had something urgent to deal with.
D.
Tom had gone to New York but he had something urgent to deal with.
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