设NA为阿伏加德罗常数的数值，下列说法正确的是
A．常温常压下， 16gO3气体含有氧原子数为NA
B．标准状况下， 44.8 L四氯化碳含有的分子数为2NA
C．0.1mol·L-1 氯化铝溶液中含有Al3+数为0.1 NA
D．2.4g金属镁变为镁离子时失去的电子数为0.1NA
答案：A
正确答案：A
B．不正确，标准状况下， 44.8 L四氯化碳是液体；
C．不正确，0.1mol·L-1 氯化铝溶液中含有Al3+数因缺少体积，无法计算；
D．不正确，镁元素化合价为+2，2.4g金属镁变为镁离子时失去的电子数为0.2NA
阅读下面短文，根据所读内容在表格中的空白处填入恰当的单词。 注意：每个空格只填一个单词。 There are two basic ways to see growth: one as a product；the other as a process. People have generally viewed personal growth as an external（外在的）result or a product that can easily be identified and measured. The worker who gets a promotion，the student whose grades improve，the foreigner who learns a new language—these are examples of people who have measurable results to show for their efforts. By contrast（对照），the process of personal growth is much more difficult to determine，since by definition it is a journey and not the specific signposts or landmarks along the way.The process is not the road itself，but the attitudes，feelings people have，and their caution or courage，as they meet with new experiences and unexpected difficulties.In this process，the journey never really ends;there are always new ways to experience the world，new ideas to try，new challenges to accept. In order to grow，to travel new roads，people need to have a willingness to take risks，to face the unknown，and to accept the possibility that they may “fail” at first. How we see ourselves as we try a new way of being is necessary for our ability to grow. Do we see ourselves as quick and curious？If so，then we tend to take more chances and to be more open to unfamiliar experiences. Do we think we're shy and indecisive？Then our sense of fear can cause us to hesitate，to move slowly，and not to take a step until we know the ground is safe. Do we think we are slow to adapt to change or that we're not smart enough to deal with a new challenge？Then we are likely to take a more passive role or not try at all. These feelings of insecurity and self-doubt are both unavoidable and necessary if we are to change and grow. If we protect ourselves too much，then we stop growing. We become trapped inside a shell of our own making.
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