鸡球虫的发育过程是（）
A.有裂殖增殖、配子生殖、孢子生殖三个阶段，裂殖增殖和配子生殖在宿主体内完成，孢子生殖在外界完成
B.出芽生殖或二分裂繁殖在中间宿主体内进行；裂殖增殖和配子生殖在终末宿主体内进行；孢子生殖在外界环境中进行
C.有裂殖增殖、配子生殖和孢子生殖三阶段，均在宿主体内进行
D.有裂殖增殖、配子生殖和孢子生殖三阶段，裂殖增殖在中间宿主体内进行；配子生殖和孢子生殖在终末宿主体内进行
E.裂殖增殖、配子生殖和孢子生殖三阶段，裂殖增殖和配子生殖的前期在终末宿主体内完成，配子生殖的后期和孢子生殖在传播媒介体内完成
参考答案：A
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| Is language, like food, a basic human need without which a child at a critical period of life can be 1 and damaged? Judging from an experiment in the thirteenth century, it may be. Hoping to discover what language a child would speak if a baby heard no mother 2 , the experimenter told the nurses to keep silent. All the 3 died before the first year. But clearly there was more than lack of language here. What was missing was good mothering. Without good mothering, in the first year of life 4 , the capacity to survive is seriously affected. Today no such severe lack exists as that ordered by the experimenter. 5 , some children are still backward in speaking. Most often the reason for this is that the mother is 6 to the signals of the infant, whose brain is programmed to learn language rapidly. If these sensitive periods are neglected, the ideal time for 7 skills passes and they might never be learned so easily again. A bird learns to sing and to fly rapidly at right time, but the process is slow and hard once the 8 stage has passed. Experts suggest that speech stages are reached in a fixed sequence and at a 9 age, but there are cases where speech has started 10 in a child who eventually turns out to be of high IQ. At twelve weeks a baby smiles and makes vowel-like sounds; at twelve months he can speak simple words and understand simple 11 ; at eighteen months he has a vocabulary of three to fifty words. At three he knows about 1,000 words which he can put into sentences, and at four his language differs from that of his parents in style 12 grammar. Recent evidence suggests that an infant is born with the 13 to speak. What is special about man's brain, compared with that of the monkey, is the complex system which enables a child to 14 the sight and feel of, say, a toy-bear with the sound pattern "toy - bear". And even more 15 is the young brain's ability to pick out an order in language from the mixture of sound around him, to analyse, to combine and recombine the parts of a language in new ways. | ||||
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