-- Mum, I have nothing to do in my free time but do homework.
-- My dear, you should ___ a hobby like drawing or taking photos.
A：take up
B：make up
C：set up
D：put up
将来发育成茎和叶的芽叫做（ ）
皮肤被划破而流血，不久后，会自然止血，这与下列哪一种细胞有关（ ）
—___________.
