题目内容

简述维果斯基的最近发展区的概念。

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碱水层含有的生物碱为( )

A. 酰胺类生物碱
B. 季铵碱
C. 叔胺碱
D. 芦丁
E. 黏液质
F. 根据碱性和溶解度不同分离生物碱

Walking is the earliest and simplest from exercises. By putting one foot in front of other, you can start to walk your ways towards a healthier life-style. Walking is an easy way to challenge the cardiovascular system (心血管系统),while at the same time building muscles. But to achieve these goals, a little more than a gentle walk around the block is required. Walking actually burns as many calories (卡路里) as running the same distance - if done in the correct manner and at a reasonable pace (步伐). Start with a basic program that you can complete three or four times a week. This should include five main steps: -A beginning warm-up for about 5 minutes. -A little bit faster period of 5 minutes at medium level (中等速度). -A 10 minutes "burning" at a higher level. -A 5 minutes slow down period at a medium level. -A 5 minutes cool down period at a low level again. -A suitable walking pace of around 5 kilometers per hour will burn around 80 calories in 30 minutes. In order to benefit from walking, we should

A. take it as a planned exercise
B. move as gently as possible
C. do it in a quiet place
D. go as fast as possible

黄色生物碱( )

A. 烟碱
B. 麻黄碱
C. 咖啡因
D. 甜菜碱
E. 小檗碱
F. 多数生物碱为不具挥发性和无升华性的五色固体，有苦味，但有许多例外，具有下列特性的生物碱分别是

有甜味( )

A. 烟碱
B. 麻黄碱
C. 咖啡因
D. 甜菜碱
E. 小檗碱
F. 多数生物碱为不具挥发性和无升华性的五色固体，有苦味，但有许多例外，具有下列特性的生物碱分别是