地貌即地表的起伏状态,用()表示。
A.等距线
B.等角线
C.等边线
D.等高线
参考答案:D
The rain was heavy and _____ the land was flooded.
A.consequently
B.constantly
C.continuously
D.consistently
酵母中的拓扑异构酶Ⅱ突变体能够进行DNA复制,但是在有丝分裂过程中它们的染色体不能分开。()