题目

下列有关细胞的生长与增殖的叙述中，错误的是（） A . 有丝分裂是真核生物细胞增殖的唯一方式 B . 动、植物细胞有丝分裂各时期染色体的行为均相同 C . 细胞核中DNA的含量相对稳定是限制细胞不能无限长大的因素之一 D . 显微观察洋葱根尖分生区的一个视野，往往看不全细胞周期各时期的图像 答案：AWhen a dog bites a man, it usually doesn’t make news. However, this saying change when Beijing and several other Chinese cities announced the “Civilized Dog Raising” campaign in November. The government will require Beijingers to get licenses for their dogs, and will enforce the one-dog, one-family policy. Police say the "one-dog policy" is aimed at reducing the number of dog bites and lowering the risk of rabies. According to the Ministry of Health, rabies has become the top infectious disease in China. Dangerous dogs and dogs taller than 35 centimeters, such as Great Danes, have been banned from urban areas. Pet owners are also required to clean up their dog's droppings and make sure dogs are leashed (拴着), especially in public areas. Some public areas, such as banks, are closed to dogs entirely. Dogs are regarded as man's best friend and the history of raising dogs can be traced back to the stone age. It therefore seems sad that dogs are unwelcome in Beijing. But it is not the case that Beijingers dislike dogs. Actually, there are many dog lovers in Beijing. The city now has more than 550,000 registered dogs, up 20 percent from the previous year. The problem is, actually, about living space. Different from many Westerners, most Beijingers live in urban apartment buildings, not houses in the suburbs. There is very limited open space for walking dogs. The barking, the waste, and unleashed dogs in buildings, elevators and places people gather can cause fear, fights and frustration. Beijing is not the only city to have a dog problem. Paris, London, New York and Vienna all face similar challenges and have common rules for dogs and their owners. Which of the following may be a suitable title for the story?     A．Man's Best Friend             B．Civilized Dog Raising     C．No Room For Dogs                  D．When A Dog Bites A Man What can be inferred from the above passage?     A．If a dog bites a man, it will become an important news item.     B．Rabies is the most serious infectious disease in Beijing.     C．Soon there will be no dangerous dogs or dogs taller than 35 centimetres in Beijing.     D．Beijing has trouble accommodating so many dogs. According to the passage, what should you NOT do if you are a dog owner in Beijing?     A．Walk your dog in public places.     B．Have more than one dog.        C．Raise your dog in urban apartment buildings.        D．Let your dog bark in places where people gather. In the writer's opinion, the main cause of the dog problem in Beijing is _____________.     A．the limited living space in urban areas     B．its lack of rules for dogs and their owners     C．Beijingers and westerners having different lifestyles     D．the increasing number of dangerous dogs