Mo yan's writing has ______ him a big audience, not only in China but overseas.
A：deserved
B：spotted
C：admitted
D：gained
我国科学家成功研制出H7N9禽流感疫苗，注射该疫苗可预防H7N9禽流感，从免疫和传染病的预防来看，注射的疫苗和采取的措施分别是（ ）
如果你生活在宋元时期，看不到的社会现象是（ ）
