单项选择题
A.To attend a conference. B.To see the planetarium. C.To change planes. D.To go sightseein
A.On foot and by boat. B.By car and on foot. C.By air and by ear. D.By air and by bus.
A.She has recently gone there. B.It's not a very good one. C.There's one in her home town. D.It will be closed when she's fre