皮皮学，免费搜题
登录
搜题
【判断题】
关键词应该是从论文大标题、文中各级标题和正文中选出来的能够反映论文主题概念的词或词组，以便文献标引或检索工作。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】According to the professor, what is a common reason for migration that does NOT apply to baleen whales?
A.
The need to avoid lower water temperatures
B.
The need to raise young in a suitable environment
C.
The need to find better feeding grounds
D.
The need to find a mating partner
【简答题】What is the reason of the cold snap?
【简答题】What physiological reason for yawning is mentioned?
【简答题】What is the reason for extinction of many fish species?