No one loves me more than my parents, especially my father. My father is stout and strong, severe look on his face and keen expressive eyes. At first sight you may feel him hard____ (approach). In fact, he is very kind and considerate. I believe my father is a____ (talent) man. He decisive and efficient in doing things. By his own talents and years of efforts, he____ (provide) the family with a good social position and a____ (relative) rich life. Besides, he lives in harmony____ others and never quarrels with anyone, so people from all walks of life come to my house, from____ I've gained lots of social experience. But at home he is a strict parent who is hard on me and has high____ (expectation) of me. I can see that my idling away time____ (hurt) him deeply, while if I have done something great and meaningful, such as____ (write) a book, he will be more excited than me. I always remind myself I must go on and on, and never ____ I give up halfway.

线圈abcd转动过程中经过图甲．乙位置时，导线a b所受磁场力的方向____（选填“相同”“相反”），原因是____．