通读全文,根据第一段“Over the past half-century, scientists have settled on two reasonable theories related to baby talk. One states that a young child’s brain needs time to master language. The second theory states that a child’s vocabulary level is the key factor.”( 在过去的半个世纪...
Over the past half-century, the tools of neuroscience have revealed much about the workings of the human brain. Now researchers are pushing forward in a new frontier: exploring what goes on in the mind of man's best friend. The study of canine cognition(犬科动物认知)has taken off in recen...
Over the past half-century, North America has lost more than a quarter of its entire bird population, or around 3 billion birds. "We saw this great net loss across the entire bird community," says Ken Rosenberg, a scientist in Ithaca, N.Y. "But we also knew that other bird populations...
【解析】61.has become,考查时态,Over thepast half century和现在完成时态连用.62.a,考查冠词,泛指一种方法,所以用不定冠词63.hoping,考查现在分词,hope和句子主语之间是主动关系,所以用现在分词作状语64.them,考查人称代词,指代前面的chemicals,所以用them作宾语.65.harmful,考查形容词,作定语修饰名词,所以用形容...
根据时间标志词over the past half century可知,这是表示过去的事情对现在的影响,故用现在完成时。3. 确定语态。主语"使用化肥"和动词"become"是主动关系,此外这里的主语是指使用化肥这件事情,需使用第三人称单数,故答案为has become。结果一 题目 Over the past half century,using chemical fertilizers(1)___(...
V.短文改错Over the past half century, it has become verycommon for farmers to use chemical fertilizers infarming. It's a great way to stop crop disease and in-crease produce. Recently, however, scientists havebeen found that long-term use of these fertilizers cancause damage to the land an...
百度试题 结果1 题目 Over the past half century, ___ chemical fertilizers has become very common in farming. A. having used B. use C. used D. using 相关知识点: 试题来源: 解析 D 反馈 收藏
由Over the past half century时间状语可知,该句应为现在完成时,结合主语using chemical fertilizers为动名词作主语,谓语动词应为单数形式。故填has become。 (2)题详解: 考查代词。句意:许多农民欢迎它们,认为这是防止作物病害和提高产量的好方法。分析句子可知,此处指代前文出现的复数名词“chemical fertilizers”,...
Over the past half century, using chemical fertilizers ___ very common in farming. A. had become B. became C. has become D. becomes 答案 C相关推荐 1Over the past half century, using chemical fertilizers ___ very common in farming. A. had become B. became C. has become D. becomes ...
百度试题 结果1 题目【题目】短语互译over the past half century 相关知识点: 试题来源: 解析 【解析】在过去的半个世纪里 反馈 收藏