A、
0.91.
B、
0.004.
C、
0.19.
D、
0.04.
【正确答案】
B
【答案解析】
A、
They are changing all the time.
B、
They are as important as long-term trends.
C、
They are relatively stable.
D、
They are not so important as long-term trends.
【正确答案】
D
【答案解析】
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