单项选择题A.several weeks.B.until your doctor tells you.C.12 months.D.at least 6 months.
单项选择题A.by credit card.B.with cash.C.with a cheque.D.he doesn’t want to buy them.
单项选择题A.a shop.B.a university campus.C.a library.D.an airport.
单项选择题A.anemia.B.shingles.C.hepatitis.D.HIV.
单项选择题A.we lose a day.B.we add 24 hours.C.we gain 12 hours.D.we add an extra month.