可降低血液黏滞度，预防血栓的形成且有益老年人健康的食品是（）。
A、燕麦
B、花生
C、芝麻
D、黑木耳
参考答案：D
根据句意及母填空。
1. Lots of people go to work by s______.
2. The disabled man d______ on his parents all his life.
3. It will take you ten m______ to walk there.
4. Beijing is in the n______ of China.
5. It's about two k______ from here to the downtown of the city.
We ___________ when the teacher came in.
A．were talking
B．talked
C．talk
D．are talking
