A．use­by dates are not helpful or reliable

　　B．more consumers get worried about food safety

　　C．most consumers often misunderstand use­by dates

　　D．the quality level of different foods changes differently

　　答案　C　[细节理解题。根据第七段第二句“We want this to be clearly communicated so consumers are not misunderstanding

　　the data and contributing to a lot of waste”可知，科学家们需要一个标准的解释以消除消费者对保质期的误C。根据第四段第二句和第六段第二句也可得出答案。]

　　Passage

　　4

　　体裁：夹叙夹议　话题：善意换来善意　词数：294　时间：5′

　　(2017·临沂高三教学质检，B)My daughter and I collected the empty cans and bottles in our home this morning.We had 6 full garbage bags so I knew we would be spending a bit more of time at the recycling center.When we got there，a man and his kids were also doing the morning recycling and were using two of the four machines to recycle their plastic and cans.Luckily，we were able to use the 2 remaining machines.

　　Of course，there were others that came，but when they saw the two families with garbage bags full of recycled things，they quickly left.However，one woman came in with just 5 cans and looked as if she was in a hurry.So I stopped what I was doing and let her in to recycle her cans.Of course，she was grateful，and it felt good to let her go ahead of me.But that was not the whole story.

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