The word “They” in line 10 refers to A、 powerful muscles B、 bodies C、 jaws D、 flying reptiles 喵查答案:flying reptiles ……继续阅读 »
According to the passage, pterosaurs were probably “not skillful fliers” (lines 10-11) because A、 of their limited wingspan B、 of their disproportionately large bodies C、 they lacked muscles needed for extended flight D、climate conditions of the time provided insuffic……继续阅读 »
Generally, a complete abstract should include several key elements like the background, the problem, the method, the results, etc. A、正确 B、错误 喵查答案:正确 ……继续阅读 »
A good Reference should be authoritative, up-to-date, and journal-targeted. A、正确 B、错误 喵查答案:正确 ……继续阅读 »