正确答案: B

折光系统不需调节，物体即可在视网膜上清晰成像

题目：正常成人眼看6m以外物体时（　　）

解析：略

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学习资料的答案和解析：

[单选题]The boy showed complete_________of his parents，advice．

disregard

[单选题]What prompted Sequoyah to develop his alphabet?

Sequoyah was a young Cherokee Indian．son of a white trader and an Indian Squaw(北美印第安女人)．At an early age，he became fascinated by“tile talking leaf”，an expression thathe used to describe the white man’s written records．Although many believe this"talking leaf”to be a gift from tile Great Spirit，Sequoyah refused to accept that theory．Like other Indians oftile period，he was illiterate，but his determination to remedy tile situation led to the inventionof a unique 86 character alphabet based on the sound patterns that he heard． 　　His family and friends thought him mad，but while recuperating(恢复)from a huntingaccident．he diligently and independently set out to create a form of communication for his ownpeople as well as for other Indians．In l821，after twelve years of work，he had successfully de。veloped a written language that would enable thousands of Indians to read and write． 　　Sequoyah’s desire to preserve words and events for later generation has caused him to be remembered among the important inventors．The giant redwood trees of-California，called“se-quoias(红杉)”in his honor，will further imprint his name in history． 根据以上内容，回答下面的题目。What is the most important reason that Sequoyah wiU be remeIll]bered?

Future generations．

[单选题]胸骨左缘第3～4肋问搏动（　　）

根据材料回答下面的题目下列情况可出现哪些阳性体征?游离腹水1000mL以上时（　　）

右心室肥大