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问题 填空题
从方框中选词并用其适当形式填空。
            health, orange,they,China,have
1. The two boys like ____ food,  they don't like American food.
2. David ______ got some apples.
3. Vegetables and fruit are ______ food,  We should eat them every day.
4. How many ______ are there in the bag?
5. Those are ______ favourite food.
答案

1. Chinese   2. has   3 healthy   4. oranges   5. their

单项选择题

背向散射回声强度的射频测定在超声造影技术上有什么用途:

A.用以定量评价超声造影效果 

B.加速血流速度 

C.增大血流量 

D.增强超声造影效果 

E.消除超声造影的副作用
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问答题 简答题

简述经济基础和上层建筑及其相互关系。
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