单项选择题

听材料，选出正确答案。 A. Ken has something wrong with his ears. B. Ken is better known than before. C. Ken attended the important lecture. D. Ken is always absent-minded.

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下列蔬菜种子属于植物学上的种子的是

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单项选择题

A bar magnet is held in a vertical orientation above a loop of wire that lies in the horizontal plane as shown in Figure OQ31.7. The south end of the magnet is toward the loop. After the magnet is dropped, what is true of the induced current in the loop as viewed from above?