[单选题]下列脂肪酸中，对胎儿脑神经系统和视网膜发育有重要作用的是（ ）
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- 1. 有四只老鼠一块出去偷食物(每个都偷了)，回来时，族长问它们都偷了什么，老鼠A说：我们每个都偷了奶酪。老鼠B说：我只偷了一颗樱桃。老鼠C说：我没偷奶酪。老鼠D说：有些人没偷奶酪。族长观察了一下，发现它们当中只有一只老鼠说了实话，那么是（）只老鼠说了实话。
- 2. 治疗感冒的通鼻手法是从眼角按揉至鼻翼两侧，并在鼻翼两侧重点按揉。
- 3. 在进行模型训练时，为了加速训练过程，可以考虑以下哪些策略？
- 4. Sometimes it is better not to know the of a country that you are visiting it is to know just a little of it. The _______ is this: the natives of your host country will often rush to if you seem completely lost and helpless. But they will usually misunderstand your small attempts to speak their language. They will think that you know more than you do. For example, I once asked three people in carefully memorized phrasebook Spanish how to get to a bus station in Mexico City. In reply each of them poured out a flood of (大量) complicated Spanish. The result was _____ I didn’t understand a word and wandered (徘徊) around for an hour before I found the station. I had missed the bus. The next time I met a situation like this in another city, I was a lot smarter，so I acted dumbly(哑). Trying to look very pitiful, I a stranger and asked simply, “Bus station?” He not only told me how to get there. He showed me the , walking three blocks out of his way to help a poor, dumb and helpless .
- 5. 老年人衣物的选择应注重（ ）
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