【单选题】
One big of formal education is the high cost.
【单选题】
We can certainly deliver high-quality education to many students at much ________ cost.
【单选题】
We can certainly deliver high-quality education to many students at much ________cost.
【单选题】
Lifelong learning is both formal and non-formal; and the boundaries between face-to-face teaching and ___________ education are increasingly blurred.
【单选题】
For programs with_________ audiences, the cost of commercials is high.
【单选题】
— Why do you think the distance education cannot take place of the formal education?— I take this opinion __________ my experience.
【单选题】
The building is twice [填空] big as that one.
【单选题】
21.Sex education in primary school is still a big _____ in China today.
【单选题】
The mountain is ____ 6.3 kilometers high, but it is not the highest one.
【单选题】
Every year, one student in our high school wins a scholarship that ____one year of college.