反映了用药经济性和安全性( ) A．治愈率，显效率，好转率等 B．适当的用药时间

视网膜中央凹内的一个视锥细胞与一个双极细胞形成一对一的连接，后者又与节细胞形成一对一的连接，以精确传导视觉。

To find how the name Canada came about we must go back to the 16th century. At that time, the French dreamed of disclosing and controlling more land, of expanding(扩展)trade beyond(超出)  their borders and of spreading their faith(信仰) across the world .In 1535, Francois I ,King of France, ordered a navigator (航海家) named Jacques Cartier to explore(探险) the New World and search for a passage to India.

Cartier first arrived at the Gulf of the St. Lawrence, which he wanted to explore. He did not know what to expect but he hoped that this Gulf was just an arm of the ocean between two islands. If it was, he would soon be on his way to the Far East. So he sailed upstream along the St. Lawrence River. However, instead or reaching Asia he arrived at Quebec or Stadacona, as the Indians called it. It was at this point that the term “ Canada” entered the country’s history. Apparently the word “Canada” came from an Indian work “Kanata”, which means community or village. Cartier first used it when he referred to Stadacona or Quebec. What a huge “ village” Canada is!

小题1:In the early sixteenth century , the King of France ordered Cartier to ______

A． find the new world

B． build an entirely new country

C． go and visit the American Indians

D． get more information about America and find a way to Asia小题2:Having reached the Gulf of St. Lawrence Cartier thought _____

A． he had already got to India

B． it was a water way to the New World

C． it was a water passage to the East

D． he had sailed into the Atlantic小题3:In the early sixteenth century , Quebec was only ____.

A． an Indian village

B． a little town in southern Canada

C． a village at the entrance to the Gulf of St. Lawrence

D． the place which we call Canada now小题4:Pick out the right statements from the following _____

A． Quebec was a village and Stadacona was another

B． Cartier mistook Quebec for Stadacona

C． Stadacona was a village in Quebec

D． Stadacona was what the Indians called Quebec then小题5:“Canada” was first used to refer to _____

A． a small town in Stadacona

B． the place called Quebec

C． a long water passage

D． a huge village including Quebec and Stadacona

科学家正在研究一种检查体内隐藏的癌症的新方法：检查人体内是否有一种使肿瘤长期存在的蛋白质。这种检查方法可能非常准确。通常情况下，胚胎在子宫中发育以后，这种名为端粒酶的化学物质就会消失，然而癌细胞能够制造这种物质，从而使自己不停地分裂，不按正常规律衰老和死亡。
上面的论述如果正确，最能加强以下哪一项中所提出的观点( )

A．通过检查人体内是否有端粒酶来证明是否隐藏癌症的方法是非常准确的。

B．癌细胞能够制造端粒酶蛋白质，从而使蛋白质不停地分裂，不按正常规律衰老和死亡。

C．通过检查人体内是否有端粒酶可以证明是否隐藏癌症。

D．端粒酶这种蛋白质不停地分裂，不按正常规律衰老和死亡，从而使肿瘤在人体内长期存在。

根据所学知识回答以下问题：

（1）“植物人”没有意识、感觉和运动，可以判断是脑的__________损伤了。

（2）“舞蹈症”患者的动作不准确、缺乏平衡感，可以判断是脑的_________发生了病变。

（3）在体育课上，老师嘱咐同学们在运动时要特别注意保护好后脑，请你对此作出解释：_____________________。 

（4）为了有效地保护中枢神经系统，在骑摩托、滑冰时要采取哪些保护措施？_______________。

斗轮机的集中润滑装置包括哪些？