题干
—Does Potter like playing computer games?
—No, he __________. He only likes reading books.
A：isn't
B：don't
C：doesn't
D：didn't
答案(点此获取答案解析）
C
—Does Potter like playing computer games?
—No, he __________. He only likes reading books.
A：isn't
B：don't
C：doesn't
D：didn't
2B（g）+ C（g），若反应物浓度由0.1mol·L－1降到0.06mol·L－1需20s，那么由0.06 mol·L－1降到0.024 mol·L－1，需要反应的时间是（ ）