(2019 沧州一模)Beijing Opera came into being after 1790. It has a ________ of over 220 years.
A.culture B.meaning C.science D.history
(2019 淮安改编)—What do you think of working as a doctor?
—It's a good job to help people keep ________.
A.busy B.strict C.healthy D.calm
Each of us _____ a life goal, which will guide us to a bright future.
A.has B.have C.will have D.had
创新题Plants take in carbon dioxide ________ then turn it into oxygen in the air.
A.but B.although C.unless D.and
易错题I'm sorry, ________ I won't be able to come tonight.
A.for B.and C.but D.then
易错题The words “racecar”， “kayak” and “level” are the same ________ they are read left to right or right to left.
A.since B.though C.unless D.whether
