杨振宁在1990年至2005年发表的期刊论文数量是()
A.49篇
B.56篇
C.100篇
D.300篇
参考答案:B
In winter people usually keep flowers in their houses to them from the cold.
A.produce
B.provide
C.protect
D.plant
乳剂的靶向性特点在于其对下列哪项有亲和性
A.肝脏
B.脾脏
C.骨髓
D.肺
E.淋巴系统