-- What beautiful shoes you're wearing! They must be expensive.
-- No, they only 10 yuan.
A:spent
B:took
C:paid
D:cost
我国有不少举世无瞩的珍稀特有树种,其中誉为植物界的“大熊猫”的是( )
一根绳子长42m,对折3次后,每段长( )