某食物蛋白质构成绝大部分为谷蛋白,该食物蛋白质的限制性氨基酸可能是()
A.蛋氨酸
B.赖氨酸
C.苏氨酸
D.色氨酸
E.亮氨酸
参考答案:B
根据句意及首字母提示写出所缺单词。
1. - Hi, Betty. What are you _____ to?
- I'm looking for my new watch.
2. The s _____ is dangerous to swimmers.
3. I saw the animals in Australia, such as kangaroos and c_____.
4. The car stopped a _____ the road.
5. He told us the accident in d_____ .
根据江河水中溶解氧的变化过程,可将河流的自净过程分哪几个阶段?