ঢাকা বিশ্ববিদ্যালয় English 2017 ভর্তি পরীক্ষার MCQ প্রশ্নব্যাংক, নির্ভুল উত্তরমালা এবং ব্যাখ্যাসহ সমাধান। ১২৭+ প্রশ্ন দিয়ে প্র্যাকটিস করুন, মক টেস্ট দিন এবং সহজে PDF ডাউনলোড করে প্রস্তুতি প্রস্তুতি নিশ্চিত করুন
আপনি কি DU নিয়োগ পরীক্ষার জন্য নিজেকে প্রস্তুত করছেন? নিয়োগ যুদ্ধে টিকে থাকার সবচেয়ে কার্যকর উপায় হলো বিগত বছরের প্রশ্ন নিয়মিত প্র্যাকটিস করা।
The loss of environmental purity is the price that we pay for many of the benefits of modern technology. We now have cars and buses on our roads and highways, but we risk suffering from smoke and dust-induced diseases. We have to build factories and expand our cities, but in the process our forest lands are shrinking, which is reducing our wildlife. Many countries use nuclear power, but there is always the risk of radiation. By increasing agricultural production with fertilizers, we pollute our water bodies. The highly developed nations of the world are not only the immediate beneficiaries of the good that technology brings; they are also the first victims of environmental diseases that technology breeds. In the past, the environmental effects which accompanied technological progress were limited to small areas, but in our time, the new hazards are really widespread Today's air pollutions, for example, cover vast areas of the world ☐ and can cause health problems for millions.
Ageing is a normal process of human development that takes place on several levels: biological, psychological and social although it is not certain what causes ageing, most gerontologists would agree that ageing is the result of a combination of both internal and external processes. The "wear-and-tear theory" compares the human body to a machine that over time wears down from use. According to this theory, bodily systems receive cumulative damage from both external forces, such as toxins, released as a result of metabolism. Cells become damaged and increasingly fail to reproduce or repair themselves. They die off in larger numbers as we age. the "combination theory" explains that influences such as stress and diet, each person is born with a genetically predetermined life expectancy that cannot be exceeded This interaction of external factors and internal programming would account for individual variations in the life span. The mystery surrounding why we age is still a topic of numerous ongoing studies. Perhaps, one day we will truly know why we age.
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