句型：This is a... It has... — 英语选择题
题目
小美在公园里看到一种植物：它是一朵花，有红色的花。她想用学过的句型介绍它，下面哪一句说得正确？
A. This is a flower. It has red flowers.
B. This is a tree. It has red flowers.
C. This is a flower. It has green trees.
D. It has a flower. This is red flowers.