问题详情

Which question is NOT answered in the article？
A．How many plant species found outside tropical rain forests could be used in the treatment of cancer？
B．Which plant has a product used for the treatment of anxiety？
C．Worldwide, what is the total annual production of synthetic robber？
D．Which rain forest plant can be used for the treatment of eye disease？此题为多项选择题。请帮忙给出正确答案和分析，谢谢！