问题
选择题
—Let's play soccer.
—______. [ ]
A. Yes, I do
B. That sounds good
C. No. It's on the desk
D. Yes, it is
答案
答案：B
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—Let's play soccer.
—______. [ ]
A. Yes, I do
B. That sounds good
C. No. It's on the desk
D. Yes, it is
答案：B
该反应达到平衡状态的标志是[ ]