Đột biến gen phát sinh do các tác tác động lí, hoá hay sinh học ở ngoại cảnh hoặc do những rối loạn sinh lí, hoá sinh của tế bào đã gây ra A. những sai sót trong quá trình nhân đôi của nhiễm sắc thể. B. những sai sót trong quá trình phiên mã C. những sai sót trong quá trình tnhân đôi ADN D. những sai sót trong quá trình phân li của các gen (giải thích chi tiết dùm em ạ :( )

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VIII. Read the following text and complete the statements below. Sport is one of the UK’s most popular leisure activities, with two- thirds of all adults taking part in one or more sporting activities. Sadly, this is not true for children and young adults. Of all sporting activities, walking is by far the most popular for men and women of all ages. While men tend to dominate golf and “cue sport” such as snooker and billiards, women generally prefer swimming, keep- fit classes and yoga. The UK claims to be among the top five most successful nations in world sport. UK sportsmen and sportswomen hold over 50 world titles in a variety of sports, such as professional boxing, modern pentathlon, rowing, snooker, squash and motorcycle sports. The Government’s view is that sport is an important component of regeneration and can have a beneficial effect in helping the development of run- down areas. 71. Two- thirds of all adults taking part in ______. A. one sporting activities B. many sporting activities C. one or more sporting activities D. no sporting activities 72. Among sporting activities, walking is the most popular for ______. A. children B. men and woman C. young adults D. men only 73. Women generally like ______. A. golf B. keep- fit class C. “cue sports” D. swimming, keep-fit classes and yoga 74. UK sportsmen and sportswomen hold over 50 world titles in ______. A. a variety B. “cue sports” C. motorcycle sports D. keep- fit classes 75. The Government’s view is that sport can have a beneficial effect in helping the development of ______. A. running activities B. neglected areas C. prosperous areas D. remote areas