单选题 Most species of this plant thrive in ordinary well-drained garden soil and they are best planted 8 cm deep and 5 cm apart.

【正确答案】 A

【答案解析】动词辨析。thrive兴旺，繁荣，茁壮成长；A．develop well生长，发展，发育得好； B．grow taller渐渐长高；C．mature成熟，到期；D．bear fruit结出果实，奏效；因此选项A为答案。