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【单选题】
下列选项属于二手资料的缺点的是A.
相关性差
B.
收集成本高
C.
收集时间长
D.
收集程序复杂
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
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【单选题】While a current is flowing through a wire, the latter is being heated.
A.
电流流过导线时， 导线就会同时被加热。
B.
电流流过导线时， 导线就发热。
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【单选题】. While typing, Helen has a habit of stopping _____ to give her long and flowing hair a smooth.
A.
occasionally
B.
simultaneously
C.
eventually
D.
directly
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【简答题】While typing, Helen has a habit of stopping ______ to give her long and flowing hair a smooth. A now and then B.over and over C.up and down D.here and there
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