问题
单项选择题
咖啡碱、茶碱、可可碱都是（）类衍生物，是食品中重要的生物碱类苦味物质。
A、嘧啶
B、嘌呤
C、喋呤
D、吡啶
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
咖啡碱、茶碱、可可碱都是（）类衍生物，是食品中重要的生物碱类苦味物质。
A、嘧啶
B、嘌呤
C、喋呤
D、吡啶
参考答案：B
你肯定听说过”早睡早起身体好” 这句著名的俗语吧。为什么这么说呢？请看下文找找依据吧，然后让自己养成良好的生活习惯。 There is an old saying. It tells us we must go to bed 26 and get up early in the 27 .Then we will be 28 .We will also be rich and 29 .That is right .The body must have enough sleep to be healthy .Children of young age should have 30 hours sleep every night. Children who do not have enough sleep 31 do their work well and 32 may not be healthy. The body also 33 exercise .Walking ,running ,jumping and playing games are all exercise .Exercise keeps the body strong . Exercise also helps the blood (血液) to move around inside the body. It’s very 34 .Our blood moves to all parts of our body. The head also needs blood So exercise also helps us to __35___ better.
|