为了消除挠度测量误差，并掌握实际放大倍数，可采用（）的办法。

He knows nothing about it, so he can’t help _______ any of your work.

A．doing

B．to do

C．being doing

D．to be done

When she looked ahead, Florence Chadwick saw nothing but a solid wall of fog. Her body was numb(全身麻木). She had been swimming for nearly sixteen hours. Already she was the first woman to swim the English Channel in both directions. Now, at age 34, her goal was to become the first woman to swim from Catalina Island to the California coast.

On that fourth of July morning in 1952, the sea was like an ice bath and the fog was so dense she could hardly see her support boats. Sharks cruised toward her lone figure, only to be driven away by rifle shots. Against the cold sea, she struggled on ---- hour after hour ---- while millions watched on national television.

Alongside Florence in one of the boats, her mother and her trainer offered encouragement. They told her it wasn't much farther. But all she could see was fog. They urged her not to quit. She never had … until then. With only a half mile to go, she asked to be pulled out.

She told a reporter hour later, "Look, I'm not excusing myself, but if I could have seen land I might have made it." It was not tiredness or even the cold water that defeated her. It was the fog. She was unable to see her goal.

Two months later, she tried again. This time, despite the same dense fog, she swam with her goal clearly pictured in her mind. She knew that somewhere behind that fog was land and this time she made it! Florence Chadwick became the first woman to swim the Catalina Channel, eclipsing(超出) the men's record by two hours!

44. Florence Chadwick was the first woman to swim across ________.

A.the English Channel             B.the Catalina Channel  

C.the California coast              D.Catalina Island

45. Florence failed on her first trial mainly because of _______.

A. the sharks     B. the tiredness      C. the cold water     D. the bad weather

46. The underlined word “then” in this passage refers to the period when _______.

A. she had swum nearly sixteen hours           B. sharks swam toward her

C. she couldn’t see her support boats          D. millions of people watched her on TV

47. We can infer from the passage that it was ______ that resulted in her success.

A. her family’s encouragement            B. her iron will 

C. her swimming skills 　                D. the good weather

民生问题是永恒的焦点和热点。在促进政府解决物价、住房、医疗、教育、就业等民生问题上，人大代表应该

A．行使决定权，对重大民生问题作出决策

B．行使质询权，对政府工作提出不同意见

C．行使立法权，制定法律法规约束政府行为

D．行使提案权，依法提出民生问题的议案

男性，52岁。因咳嗽、痰血伴体重减轻2月就诊，检查发现右肺上叶空洞性病变，洞壁光整，疑为结核。

结核病空洞的特征应是（）

A.好发肺上叶和下叶背段，洞壁光整，很少有液平

B.空洞周围炎症病变多

C.空洞内壁不平整

D.空洞偏心

E.空洞内液平高

出境邮寄物有下列哪些情形的，寄件人须向检验检疫机构报检，由检验检疫机构实施现场和实验室检疫( )

A．进口国有检疫要求的

B．出境邮寄物中有微生物、生物制品、血液及其制品等特殊物品的

C．寄件人有检疫要求的

D．检验检疫要求检疫的