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  3. You probably have a long mental list of moments and facts you wish you could remember—but actually you cannot. The good news,【B1

You probably have a long mental list of moments and facts you wish you could remember—but actually you cannot. The good news,【B1

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问题     You probably have a long mental list of moments and facts you wish you could remember—but actually you cannot. The good news,【B1】______, is that while such memories may be currently【B2】______, they are not entirely gone, and could theoretically be【B3】______, according to a new brain research.
    In the study, biologist Jeffrey Johnson【B4】______16 college participants through an FMRI machine (which【B5】______nervous activity via blood flow)to compare brain patterns【B6】______memory formation and recall. First, he showed the students various common words and had them【B7】______a few tasks: say the word backwards in your head,【B8】______its uses, and picture how an artist would【B9】______it. Then, 20 minutes later, after the students re-entered the FMRI machine, Johnson showed them the list of words and asked them to recall【B10】______they could from before. Finally, he compared brain activity from both【B11】______and what he found will surprise you.
    Using【B12】______is called "pattern analysis" , it’s possible to【B13】______a unique pattern of brain activity to every individual thing we do. This means that when a participant says the word "apple" backwards the【B14】______pattern of brain activity is different from when he pictures the fruit.【B15】______interestingly, there is close similarity between the pattern that emerges when we【B16】______an activity and when we later recall it. The stronger our memory, the【B17】______the pattern, but as Johnson found, even at a moment【B18】______we cannot remember anything, our nerve cells still fire in a way that【B19】______the activity of when we formed the memory. This【B20】______that sometime in the future we may be able to retrieve the memories we thought we’d lost forever.
【B16】
选项 A、set about
B、sit for
C、engage in
D、go through
答案C
解析 原句已知信息是：有趣的是，当我们在——一项活动时和之后我们回忆这项活动时，我们的大脑图示是十分相似的。可判断空格处需要表示“从事，进行”等意思的词，选项[C]engage in“参与，从事”，符合文义，是正确选项。
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