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阅读理解。 Winter's short days are more than cold. For many people, winter depression, the most common type of Seasonal Affective Disorder(SAD), is as much a part of the reason as hats and scarves (围巾). Winter serious SAD sufferers may need medical treatment. Those feeling a little blue can help themselves by sticking to a healthy lifestyle. Here are some tips: Pace yourself. Don't expect to do everything you normally can. Set a realistic schedule. Don't listen to negative thinking, like blaming yourself or expecting to fail. Get involved in activities that make you feel good or feel like you've achieved something. For example, play table tennis or badminton. If you are feeling depressed, you may feel like staying away from friends. Yet this is a time when a friend's support can be helpful. Call them regularly. Remember, the more we put off calling or visiting a friend, the harder it is to rebuild a friendship. Think clearly about what's wrong or right. Instead of giving in to vague feelings of sadness, look at your problems objectively. Break down problems into specific issues that you can work on. Regular exercise helps to prevent and ease depression. Eat well. Studies show that a healthy diet can help to maintain(keep) a healthy body and mind. The vitamins, minerals and micro-nutrients found in a balanced diet may help our bodies to produce feel-good hormones (荷尔蒙).Foods containing chemicals to help produce feel-good hormones include bananas, turkey, nuts and seeds. Eat at least five pieces of fruit and vegetables every day. P.S.Symptoms (症状) of SAD: No interests or pleasure in things you used to enjoy Increased need for sleep A change in eating habits, especially an appetite for sweet or starchy (含淀粉的) foods Weight gain A heavy feeling in the arms or legs A drop in energy level Difficulty in concentrating Overly emotional Avoidance of friends and social situations Frequent feelings of guilt Long-term feelings of hopelessness, and physical problems, such as headaches 1.The writer of the passage agrees that ______. A. the cold in winter makes us suffer from SAD B. hats and scarves are as important as SAD C. everyone of us meets SAD in winter D. we are blue mainly because of short days in winter 2. It can be inferred that ______. A. a more darkness will make us sad B. we should wear hats and scarves in winter C. a healthy lifestyle prevents us from serious SAD D. staying away from friends makes us depressed 3. When we pace ourselves, we ______. A. don't do anything we can B. make a practical plan C. expect to succeed in nothing D. think something of guilt 4. The passage includes the following EXCEPT _____. A. the earlier we meet friends, the easier it is to rebuild a friendship B. if we give up to unclear feelings of sadness, we'll be caught in the SAD C. playing table tennis helps us achieve whatever we want D. feel-good hormones from a balanced diet can help keep a healthy body
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【判断题】 549 . 硬盘数据传输率包括内部传输率和外部传输率,内部数据传输率的高低才是衡量硬盘性能的真正标准。
A.
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B.
错误
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正确
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【简答题】在细胞免疫中,效应T细胞杀伤靶细胞主要有两种途径:细胞裂解性杀伤(图1)和诱导细胞凋亡(图2)。前者指效应T细胞分泌诸如穿孔素一类的介质损伤靶细胞膜,后者指效应T细胞通过表面FasL,与靶细胞表面的Fas结合,诱导靶细胞凋亡。请分析并回答: 人体内的效应T细胞来自()的增殖、分化。
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【判断题】 客户的正反馈是一种网络外部性。当一个客户加人某个社区时,随着在社区中建立越来越多的关系,客户就受到了网络的约束,而使脱离网络的成本增加。
A.
正确
B.
错误
【简答题】在细胞免疫中,效应T细胞杀伤靶细胞主要有两种途径:细胞裂解性杀伤(图1)和诱导细胞凋亡(图2)。前者指效应T细胞分泌诸如穿孔素一类的介质损伤靶细胞膜,后者指效应T细胞通过表面FasL,与靶细胞表面的Fas结合,诱导靶细胞凋亡。请分析并回答 人体内的效敏T细胞来自()的增殖、分化。
【简答题】在细胞免疫中,致敏T细胞(即下图中效应T细胞)杀伤靶细胞主要有两种途径:细胞裂解性杀伤(图1)和诱导细胞凋亡(图2)。前者指致敏T细胞分泌诸如穿孔素的介质损伤靶细胞膜,后者指致敏T细胞通过表面FasL与靶细胞表面的Fas结合,诱导靶细胞凋亡。 人体内的致敏T细胞可以来自()的增殖、分化,细胞免疫就是依靠致敏T细胞来杀伤靶细胞的。人体的另一种特异性免疫在杀伤病原体时,主要依靠()细胞分泌的()。
【简答题】 什么是外部性?
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