问题
单项选择题
循环气中氧浓度上升时乙烯转化率会（）。
A、上升
B、下降
C、不变
D、先上升后下降
答案
参考答案：A
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循环气中氧浓度上升时乙烯转化率会（）。
A、上升
B、下降
C、不变
D、先上升后下降
参考答案：A
What do the people usually do on weekends? Some people like to at home, but others like to go out for a walk or play football. Mr Smith hard in a factory during (在期间) the . On the weekends, he usually the same thing. On Saturday he washes his car and on he goes with his family to a village(村庄) by car. His uncle and aunt a farm there. It isn't a big one, but there is always to do on the farm. The children help with the animals and give them some . Mr and Mrs Smith help in the field(田地). At the end of the day, they are all and Mr Smith's aunt them a big meal.
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