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The researchers (i)_____ saw in crawfish frogs the behaviors, such as closed eyes or limbs tucked in toward the body, that indicate sleep in amphibians. Indeed, as is not the case for tree frogs and true toads, classic sleep behavior is (ii)_____ true frogs, including crawfish frogs, although bullfrogs, which are also true frogs, are quiescent at night.
- Blank(i)
- frequently
- rarely
- never
- Blank(ii)
- beneficial for
- undocumented in
- common among
never , undocumented in 显示答案
以上解析由 考满分老师提供。
