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How did the calf feel about the mother elephant’s roaring？
A. It was a great comfort. B. It was a sign of danger.
C. It was a call for help. D. It was a musical note.
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The neighborhood which I used to living in has changed77.___________
After five years away in my hometown, I find that 76. __________
What does the author think of the tour？
A. Tiring. B. Expensive. C. Enjoyable. D. Quick.
在25℃时，密闭容器中X、Y、Z三种气体的初始浓度和平衡浓度如下表：
物质
X
Y
Z
初始浓度/mol·L-1
0.1
0.2
0
平衡浓度/mol·L-1
0.05
0.05
0.1
下列说法错误的是：
A．反应达到平衡时，X的转化率为50％
B．反应可表示为X+3Y2Z，其平衡常数为1600
C．增大压强使平衡向生成Z的方向移动，平衡常数增大
D．改变温度可以改变此反应的平衡常数
On which days did the tourists spend most of their time on the boat？
A. Monday and Tuesday. B. Tuesday and Wednesday.
C. Wednesday and Thursday. D. Monday and Wednesday.