Many Chinese brands, __________their reputations over centuries,are facing new challenges from the modern market.
A：having developed
B：being developed
C：developed
D：developing
俗话说：“大河有水小河满，大河无水小河干”。这句话说明（ ）
学校购到一批书，按2：3：5借给四、五、六三个年级。四年级借到这批书的____ %。
Which of the following words matches the sound /'sɪŋɡl/?
民主集中制是我国人民代表大会制度的组织和活动原则。下列能正确体现这一原则的是（ ）
