题目

根据划线部分，短文改错。Hi Eva, Sorry that I haven't been in the touch for a while. But I catch cold last week, and I’ve been in bed for four day. I’m feeling better today. Lucky my classes won't start till next week.I have good news. I'm going to a conference in you town in May, from 16th to 20th. Could you recommend a hotel where is in the centre of the town? It needs to be somewhere not too expensive because the tight budget. I’ll have a freely half-day for sightseeing. Do you think you can showed me around? Looking forward to hear from you soon.Chris在标准状况下，mg气体A与ng气体B的分子数相同，下列叙述正确的是（　　）A．气体A与B的相对分子质量之比m：nB．相同质量的气体A与B的分子数之比n：mC．相同温度下，气体A与B的密度之比m：nD．同温同压下，同体积气体A与B的质量之比n：m