A.They were unable to fold their wings when not in use.
B.They hung upside down from branches as bats do before flight
C.They flew in order to capture prey.
D.They were an early stage in the evolution of the birds.
第5题
[114-116]
A.红景天苷
B.水杨苷
C.芥子苷
D.腺苷
E.牡荆素
114.属于氮苷类化合物的是
115.属于碳苷类化合物的是
116.属于硫苷类化合物的是
第6题
选项二十二 A、红景天苷B、水杨苷
C、芥子苷D、腺苷
E、牡荆素
第122题:
属于氮苷类化合物的是
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