中药天花粉来源于葫芦科植物瓜蒌的花粉。
参考答案：错
The book which ________ at the end of last year turned out to be a great success in Shanghai. [ ]
A. came about
B. came
C. came out
D. came around
下列选项中哪个属于NoSQL数据库（）。
A、BigTable
B、Hbase
C、Oracle
D、MongoDB
