https://www.optimistdaily.com/2026/10/coffees-memory-boosting-effect-might-have-nothing-to-do-with-caffeine-study-suggests/
A.none B.stress C.divided D.worse E.better
In a small experiment, a team found something surprising. Thirty-one people who drank coffee every day stopped their usual coffee for two weeks and were (1)______ into two groups. One group drank coffee without caffeine（咖啡因）, and the other drank coffee with caffeine, but (2)______ of them knew which coffee they had. After three weeks, both groups reported less (3)______ than before. But only the first group did (4)______ on the memory tests.
A.idea B.problem C.clear D.work E.food
The team now has a new (5)______ about this. The polyphenols（多酚）in coffee are (6)______ for the microbes（微生物）that live in our stomach. The microbes then send messages to the brain, and this may change how we remember things. The study is small, so the answer is not (7)______ yet. There is still much (8)______ to do before we can be sure.
词汇短语精讲
1. be divided into 被分成（若干部分/组）
例句：Thirty-one people who drank coffee every day stopped their usual coffee for two weeks and were divided into two groups.
提示：be divided into + 数量/类别，表示「被划分成……」；divide A into B 为主动式，如 Divide the class into four groups.
2. none of ……中没有一个
例句：One group drank coffee without caffeine（咖啡因）, and the other drank coffee with caffeine, but none of them knew which coffee they had.
提示：none of + 复数名词/代词，谓语用单数或复数均可；none of them 强调「他们中没有任何一个」，与表示「两者都不」的 neither of 区分。
3. send messages to 向……发送信息
例句：The microbes then send messages to the brain, and this may change how we remember things.
提示：send sth. to sb./sth. 表示「把某物发送给……」，也可说 send sb. sth.；此处用 messages 的复数泛指「信息」。
4. be food for 成为……的食物；是……的养料
例句：The polyphenols（多酚）in coffee are food for the microbes（微生物）that live in our stomach.
提示：be food for 表示「是……的食物/养料」，用于说明食物链或营养关系；同类：Fish is food for many birds.
5. much work to do 有许多工作要做
例句：There is still much work to do before we can be sure.
提示：There is much work to do（before …）为常用句型，表示「还有大量工作要做」；work 作「工作」时为不可数名词，用 much 修饰。
句子精讲
1. One group drank coffee without caffeine, and the other drank coffee with caffeine, but none of them knew which coffee they had.
结构：三个并列分句由 and、but 连接。① One group drank coffee without caffeine 中 one group 指两组中的「一组」；② the other drank coffee with caffeine 中 the other 指两组中的「另一组」；③ but none of them knew which coffee they had 中 none of them 指「他们当中没有一个」，which coffee they had 是 which 引导的宾语从句，作 knew 的宾语。
语法：不定代词 one ... the other（两者中的「一个……另一个」）；none of + 名词/代词（全都不）；which 引导宾语从句
仿写：两组对比用 one ... the other ...：One student chose A, and the other chose B. 「全都不」用 none of them：None of them knew the answer. 仿写模板：One ___, and the other ___, but none of them ___.
2. There is still much work to do before we can be sure.
结构：主句是 there be 句型 There is still much work to do，to do 为不定式作后置定语修饰 work（要做的工作）；before we can be sure 是 before 引导的时间状语从句，表示「在我们能够确定之前」。
语法：there be 句型；much + 不可数名词（work 不可数）；不定式作后置定语；before 引导时间状语从句
仿写：「还有很多事要做」用 There is still much ... to do：There is still much work to do before the plan works. 仿写模板：There is still much ___ to ___ before ___.
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