答案及解析

　　51.c 【解析】本文第二段中提到“…because all the astronauts have contracts with an American magazine under conditions forbidding any unauthorized disclosures about their private lives.”

　　52.B【解析】本文第一句提到“Today TV audiences all over the world are accustomed to the sight of American astronauts in tip—top condition，with fair hair，crew-cuts，good teeth and…”.

　　53.B 【解析】由本文倒数第一段中的“As for the astronauts’political leanings，they seem to be towards the right.”

　　54.B【解析】talk shop意为“谈公事”。

　　55.C 【解析】A、B、D在文中均提到，是正确的，而C不对，文中提到“You would expect them to find their friends from their professional associates，but this is not the case.Rather，they prefer to make friends with the normal folk in their districts.”