如图表示某生态系统食物网，下列叙述不正确的是（　　）

    Our risk of cancer rises dramatically as we age. So it makes sense that the elderly should be routinely screened for new tumors — or doesn't it?

    While such vigilant(警觉的) tracking of cancer is a good thing in general, researchers are increasingly questioning whether all of this testing is necessary for the elderly. With the percentage of people over age 65 expected to nearly double by 2050, it's important to weigh the health benefits of screening against the risks and costs of routine testing.

    In many cases, screening can lead to additional biopsies(活检) and surgeries to remove cancer, which can cause side effects, while the cancers themselves may be slow-growing and may not pose serious health problems in patients' remaining years. But the message that everyone must screen for cancer has become so ingrained(根深蒂固的) that when health care experts recommended that women under 50 and over 74 stop screening for breast cancer, it caused a riotous reaction among doctors, patients and advocacy groups.

    It's hard to uproot deeply held beliefs about cancer screening with scientific data. Certainly, there are people over age 75 who have had cancers detected by routine screening, and gained several extra years of life because of treatment. And clearly, people over age 75 who have other risk factors for cancer, such as a family history or prior personal experience with the disease, should continue to get screened regularly. But for the remainder, the risk of cancer, while increased at the end of life, must be balanced with other factors like remaining life expectancy(预期寿命).

    A recent study suggests that doctors start to make more objective decisions about who will truly benefit from screening—especially considering the explosion of the elderly that will soon swell our population.

    It's not an easy calculation to make, but one that make sense for the whole patient. Dr. Otis Brawley said, “Many doctors are ordering these tests purely to cover themselves. We need to think about the rational(合理的) use of health care and stop talking about the rationing of health care.”

    That means making some difficult decisions with elderly patients, and going against the misguided belief that when it comes to health care, more is always better.

1934年，法国科学家约里奥﹣居里夫妇用α粒子轰击铝（₁₃²⁷Al），产生出中子和磷的放射性同位素，因首次获得人工放射性物质而得到1935年的诺贝尔化学奖．请写出该核反应的方程式?

19世纪中期以来，仁人志士为了民族的复兴进行了不懈探索。阅读下列材料：
材料一：《**条约》签订的消息传来，举国哗然。……“救亡图存”成为当时最高亢的呼声。康有为、梁启超等掀起了维新变法运动。
《剑桥中国晚清史》：“尽管维新运动没能达到它的政治目标，但它所引起的思想变化却对中国的社会和文化有着长期的和全国规模的影响。”
材料二：“九十年以前，在中国这块古老的土地上，爆发了一场对中国历史进程产生重大影响的革命。……先生是站在时代前列的历史伟人，是伟大的爱国主义者，是中国民主革命的伟大先驱，他为追求民族独立、民主自由和民生幸福贡献了毕业精力。”
——前中共中央***江泽民2001年10月9日的讲话
材料三：要帝制不再发生，民主共和可以安稳……非先将国民脑子里所有反对共和的旧思想，一一洗刷干净不可。
——陈独秀《旧思想与国体问题》
请回答：
（1）依据材料一，指出维新变法运动的主要目的是什么？这场运动有何积极作用？
（2）材料二中的“先生”指谁？“先生”领导这场革命的指导思想是什么？他所创立的第一个全国规模的统一政党是什么组织？这一政党通过那一机关刊物宣传政治思想？
（3）材料三中陈独秀等先进分子为了将“国民脑子里所有反对共和的旧思想”洗刷干净，发起了哪一场运动？在这一运动中除了陈独秀还有哪些代表人物？
（4）结合以上三则材料和所学知识，说明这些运动反映的共同主题。