问题详情：
71. I would rather this thing ___________________at yesterday’s meeting. (refer)
但愿昨天会议上没提及这事。
72. The drug, if_________________________ a day, will have no side effect. (take)
这*如果每天服用一次,不会有副作用。
73. So fast ______________ that we can hardly imagine its speed. (travel)
光传播的速度快到我们难以想象。
74. She wasn’t aware that the mushrooms were poisonous, otherwise she _____________ them for dinner. (pick)
她不知道这些蘑菇有毒，不然她就不会采来做晚餐了。
75. Sometimes ____________________ to use examples to explain abstract concepts. (helpful)
有时候举例也许有助于解释抽象的概念。
【回答】
71. hadn’t been referred to
72. (it is) taken once
73. does light travel
74. wouldn’t have picked
75. it may/might be
知识点：完成句子
题型：单词拼写
