— I used to smoke, but I've quit the habit.

— ________!Now, can you help me stop drinking?[ ]

A. Good for you 

B. Oh come on

C. You can't be serious  

D. You must be joking

门头沟“钰龙泉”利用地热水供房间洗浴用水，请计算质量为100kg的地热水，温度从70℃降低到20℃，放出的热量是        J。(c_水=4.2×10³J／(kg·℃)。