填空题
Where did tulip originally, grow?
填空题
What was Manaus famous of in those days?
填空题
When were large quantities of plantation rubber first exported from Malaysia?
填空题
What do people grow hevea trees for in tropical plantations?
填空题
What does the Kew Garden collect specifically?
填空题
What does the new director of the Kew Gardens want to change in using the garden's facilities?
填空题
Among many other fields of endeavor for the new botany, what is one of the most urgent topics to study?
填空题
According to the eighteenth-century English naturalist William Marshall, what would happen to Nature when cultivation set its foot?
填空题
By allowing for the play of what kind of corrective forces did the slow development of artificial ecosystem and villages succeed?
填空题
In summary, what did the speaker talk about?