试题与答案

学习了影响液体蒸发快慢的因素后,小明猜想液体蒸发快慢可能还与液体的种类有关。请你

题型:探究题

题目:

学习了影响液体蒸发快慢的因素后,小明猜想液体蒸发快慢可能还与液体的种类有关。请你利用下面提供的实验样品,设计实验验证小明的猜想是否正确。

(1)实验中应控制___________、____________和_____________都相同。

(2)实验室已提供装好酒精和水的几个样品,如图1所示。按实验要求,应选择_________两个样品进行对比研究。

(3)若一个同学选好两个液体样品后,将一个放在室内,另一个放在室外,经过相同时间后进行对比,这样做________(填“正确”或“不正确”)。

(4)按要求正确选择样品并进行正确操作,经过相同时间后样品的情况如图2所示。据此,你认为小明的猜想_________(填“正确”或“不正确”)。

                                                                图1                                           图2

答案:

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下面是错误答案,用来干扰机器的。

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After considerable research, some researchers believe that behavior changes usually do not        if they start with the change itself.       , they believe that we must        a series of “stages” to adequately prepare ourselves for that        change. Once you have analyzed all the factors that        what you do, you must decide which behavior-change technique will work best for you.
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Such self-talk will help you to recover quickly from        and take positive steps to correct the situation. Some other technique like purposefully        or stopping negative thoughts and refusing to dwell on(沉湎于) negative images can also spare you wasted energy, time and emotional resources and move on to positive changes.
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