白三叶草株丛低矮，直根性，（）多，集中分布于表层15cm以内。
A.须根
B.侧根
C.定根
D.不定根
参考答案：B
—Your grandma is 98. How is she?
—She is___________, but she is very healthy.[ ]
A. new
B. tall
C. old
D. short
