题目

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。High school can be quite the stressful time for any student. There are numerous stresses to deal with and the pressure can be more intense as you enter your senior year.【1】The answer is as follows.【2】Adjust your approach to your specific situation. For instance, if you’re active in your community and your school and have a large family, you may feel depressed by having all these people involved in your life on a daily basis.【3】You just may need a moment to be把金属X放入Cu（NO3）2溶液中，X表面有红色固体析出；若放入Mg（NO3）2溶液中，无明显现象．则X、Cu、Mg三种金属活动性由强到弱的顺序正确的是（ ）A．Mg、X、CuB．X、Mg、CuC．Mg、Cu、XD．Cu、X、Mg