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保护装置仅动作于故障设备，使停电范围尽可能缩小，以保证其它设备照常运行，称为继电保护的（）。
A
选择性
B
快速性
C
可靠性
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浇口套进料口球面凹坑半径应比注塑机喷嘴球头半径（）。
From childhood to old age, we all use language as a means of broadening our knowledge of ourselves and the world about us. When humans first 1 , they were like newborn children, unable to use this 2 tool. Yet once language developed, the possibilities for human kind’s future 3 and cultural growth increased. Many linguists believe that evolution is 4 for our ability to produce and use language. They 5 that our highly evolved brain provides us 6 an innate language ability not found in lower 7 . Proponents of this innateness theory say that our 8 for language is inborn, but that language itself develops gradually, 9 a function of the growth of the brain during childhood. Therefore there are critical 10 times for language development. Current 11 of innateness theory are mixed, however, evidence supporting the existence of some innate abilities is undeniable. 12 , more and more schools are discovering that foreign languages are best taught in 13 grades. Young children often can learn several languages by being 14 to them, while adults have a much harder time learning another language once the 15 of their first language have become firmly fixed. 16 some aspects of language are undeniably innate, language does not develop automatically in a vacuum. Children who have been 17 from other human beings do not possess language. This demonstrates that 18 with other human beings is necessary for proper language development. Some linguists believe that this is even more basic to human language 19 than any innate capacities. These theorists view language as imitative, learned behavior. 20 , children learn language from their parents by imitating them. Parents gradually shape their child's language skills by positively reinforcing precise imitations and negatively reinforcing imprecise ones. 请在1处填上正确答案（） 请在2处填上正确答案（） 请在3处填上正确答案（） 请在4处填上正确答案（） 请在5处填上正确答案（） 请在6处填上正确答案（） 请在7处填上正确答案（） 请在8处填上正确答案（） 请在9处填上正确答案（） 请在10处填上正确答案（） 请在11处填上正确答案（） 请在12处填上正确答案（） 请在13处填上正确答案（） 请在14处填上正确答案（） 请在15处填上正确答案（） 请在16处填上正确答案（） 请在17处填上正确答案（） 请在18处填上正确答案（） 请在19处填上正确答案（） 请在20处填上正确答案（）
为了解决台湾、香港、澳门的问题，实现祖国统一，邓小平尊重历史和现状，从实际出发，创造性地提出（）的伟大构想。
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