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调查法是课题研究的基本方法，下列不属于调查法的是（）。
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某中学活动小组对“城市中学生课外生活内容的调查”进行了研究，计划采用观察的方法，此项研究中选择（）不合适。
试析鸦片战争的历史影响。
Our stomachs can often be a mystery to us and many of us don’t realize just how much the food we eat can impact on our mood and mental well-being. According to charity Allergy UK, a shocking 45% of us suffers with food and drink intolerances, beverage—this is called food intolerance. Food intolerance is a much more common problem than food allergy and one of the most harmful symptoms can be low mood. 1 in 4 people in the UK will suffer problems with their mood or mental health every year, with anti-depressant prescriptions increasing by over 40% in the last 5 years. Recent research from York Test Laboratories, leading experts in food intolerance testing, has found that 97% of their customers reported problems relating to mood as a significant symptom of their food intolerance, of which 73% felt that their mood had significantly improved after altering their diets to remove foods to which they reacted. In addition, in a recent paper published in the Journal of Nutrition and Food Sciences, over 81% of patients reported a significant improvement in mood and mental well- being as a direct consequence of applying the dietary changes recommended by York Test. So how is it that the food we eat can have such a significant impact on our mood Bidirectional connections between the gut and the brain are complex and are regulated in the body in three different ways: through nerves, hormones and the immune system. The gut mediates the body’s immune response; at least 70 per cent of our immune system is situated in the gut and is used to expel and kill foreign invaders. Our gut contains some 100 million neurons (nerve cells), more than in either the spinal cord or the peripheral nervous system. All of these neurons lining our digestive system do much more than merely handle digestion or cause occasional nervous feelings. Our gut partly determines our mental state and plays key roles in certain diseases throughout the body. Many people will not be aware that 90% of serotonin(血清素), the brain’s "happy hormone" is produced in the gut—it is for these reasons that the gut is often referred to as the ’second brain’. In addition, research has shown that depression is frequently associated with gastrointestinal (肠胃的) inflammation—a common symptom of food intolerance. By tackling unidentified food intolerances, not only will physical symptoms benefit, but mental health symptoms can often show significant improvement. There are a number of ways to identify potentially mood suppressing food intolerances. One that I recommend is scientifically validated and well researched is York Test. Its food and drink intolerance test called Food & Drink Scan can uncover potential food and drink triggers, allowing people to simply modify their diets with life changing health benef Which is NOT one of the reasons why the gut is often referred to as the "second brain"
以下哪项是初中阶段信息技术课程目标未涉及的（）
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