试题与答案

感染赤霉菌而患恶苗病的水稻植株,要比周围的健康植株高50%以上,患病植株结实率很低;

题型:单项选择题

题目:

感染赤霉菌而患恶苗病的水稻植株,要比周围的健康植株高50%以上,患病植株结实率很低;将赤霉菌培养基的滤液喷施到水稻幼苗上,没有感染赤霉菌的幼苗也表现出恶苗病的症状;从赤霉菌培养基中提取出有以上效应的活性物质――赤霉素.通过上述实验得出的结论不正确的是()

 

A.赤霉素是植物激素

B.使水稻患恶苗病的是赤霉菌的代谢产物,不是赤霉菌本身

C.赤霉菌产生的物质使水稻患恶苗病

D.上述实验还不能证明赤霉素是植物激素

答案:

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参考答案:C, E解析:选项A,应该免征个人所得税;选项B,企业其他人员向企业借款用于购买房屋及其他财产,将所有权登记为企业其他人员,且借款年度终了后未归还借款的,按“工资、薪金项目”计征个人所得税;选...

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Physical fatigue is the well-known result of overworking your muscles. (46) Physical fatigue is usually a pleasant tiredness, such as that which you might experience after playing a hard set of tennis, chopping wood, or climbing a mountain. The cure is simple and fast: You rest, giving your body a chance to get rid of accumulated waste and restore muscle fuel.

(47) Illness induced fatigue is a warning sign or consequence of some underlying physical disorder, perhaps the common cold or flu or something more serious like cancer, while other symptoms are present that often suggest the true cause. Even after an illness passed, you’re likely to feel dragged out for a week or more. (48) Take your fatigue as a signal to go slow while your body has a chance to recover fully even if all you had was a cold. Pushing yourself to resume full activity too soon will certainly prolong your period of fatigue.

Emotional problems and conflicts, especially depression and anxiety, are by far the most common causes of prolonged fatigue. When such feelings are not expressed openly, they often come out as physical symptoms, with fatigue as one of the most common manifestations. (49) Understanding the underlying emotional problem is the crucial first step toward curing psychological fatigue and by itself often results in considerable lessening of the tiredness. Professional psychological help or career or marriage counseling may be needed.

There is a great deal you can do on your own to deal with both severe prolonged fatigue and those periodic washed-out feelings. You might try to do moderate exercise. (50) Contrary to what you may think, exercise enhances, rather than drains, engery and helps you to resist fatigue by increasing your body’s ability to handle more of a workload. At the end of a day exercise can relieve accumulated tensions, give you more energy in the evening, and help you sleep more restfully.

(48) Take your fatigue as a signal to go slow while your body has a chance to recover fully even if all you had was a cold.

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