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【单选题】
Little ________ about his own safety, though he was in great danger himself.A.
does he care
B.
did he care
C.
he cares
D.
he cared
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【多选题】下列关于朴素贝叶斯算法的论述正确的是
A.
朴素贝叶斯算法基于贝叶斯定理和特征条件独立性假设
B.
朴素贝叶斯算法使用最大似然估计来确定参数
C.
条件独立指的是数据集各个特征的取值与其他特征不相关
D.
朴素贝叶斯算法对离群值不敏感
【单选题】Why does the professor mention the wood thrush?
A.
To contrast its displacement activities with those of other animal species
B.
To explain that some animals display displacement activities other than grooming
C.
To point out how displacement activities are influenced by the environment
D.
To give an example of an animal that does not display displacement activities
【简答题】电荷有规则地 形成电流,电流方向与正电荷移动方向 ,与负电荷移动方向 。
【单选题】听力原文：W: Does the Motor Voter Law cover all the states? M: No. W: Which ones? Why not? M: Six states are not covered by the provisions of the National Voter Registration Act. They are: North Dakota (be...
A.
North Dakota and Washington D.C
B.
South Dakota and Washington D.C
C.
Wisconsin and Wyoming.
D.
Wyoming and Washington.
【单选题】一日清晨，甲发现一头牛趴在自家门前，便将其拴在自家院内，打探失主未果。时值春耕，甲用该牛耕种自家田地。期间该牛因劳累过度得病，甲花费300元将其治好。两年后，牛的主人乙寻牛来到甲处，要求甲返还，甲拒绝返还。下列哪一说法是正确的?
A.
甲应返还牛，但有权要求乙支付300元
B.
甲应返还牛，但无权要求乙支付300元
C.
甲不应返还牛，但乙有权要求甲赔偿损失
D.
甲不应返还牛，无权要求乙支付300元
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