66.Economics.
67. Because the increased cost will be more than Marge’s income. 68. Economic factors and emotional needs.
69. that homemaking gives them the deepest satisfaction. 70. stay home.
71. He wants her to give up working and stay home to look after the children. She feels, however, that this is too much for her.
72. For example, teenagers want to stay out till all hours of the night, but when it comes to getting up in the morning in time for classes, it's a different story. 73.自然界的平衡一旦遭到破坏,就会带来很多不可预知的影响. 74.迈克没来参加昨晚的聚会，也没给我打电话作任何解释。 75.还存在一个问题，那就是派谁去带领那里的研究工作。
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