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【单选题】
根能够不断生长的原因是（ ）A.
分生区不断地增加新的细胞
B.
伸长区的细胞不断地伸长
C.
根冠不断地增加新细胞
D.
分生区细胞不断地分裂出新细胞，伸长区细胞不断地伸长
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【单选题】She has long been considered a strong-willed career woman, but on hearing the death of her husband, she plunged into _____.
A.
grief
B.
mourn
C.
grieving
D.
agonize
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