三元方程组的结构解是________．
Passage 5 Questions 21 to 25 are based on the following passage. When Wally Amos was little, his family was very poor. After his parents got divorced, Amos went to live with his Aunt Della in New Y
广告的出发点是（ ），其目的是唤起消费者的购买欲，因此，广告活动具有鲜明的意图，所以，在接触广告时消费者产生一种本能的抗斥是理所当然的。
You'd better keep a spare pair of glasses（ ）in case your main pair is broken or lost.
的结构解是________．
的结构解是________．" />