良性肿瘤一般称为瘤。()
参考答案:对
如图表示生态系统中物质循环的过程,请据图回答问题:
(1)图中①、②代表的生物分别是:_______和________。
(2)图中③~⑥表示某生理过程,其中③⑤分别是__________、____________。
(3)由图可看出:动物在自然界中具有_______________的作用。
It is no longer________it was 20 years ago, ________it was so poorly equipped. [ ]
A. what; when
B. that; which
C. what; which
D. which; that