细菌有叶绿体，不需要依靠现成的有机物生活。
×
细菌的细胞结构内没有叶绿体，所有要依靠现成的有机物生活。
--- Has Mary come back yet?
--- Yes. She has got many books from her elder schoolmates, and the number ___ 1000.
A．adds up
B．adds up to
C．add to
D．add up to
白糖参保存时应采用木炭干燥法。
