[单项选择]

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, an uncomplicated sense of humour and a severely limited non-technical vocabulary.
What marks out an astronaut from his earthbound fellow human beings is something of a difficult problem. Should you wish to interview him, you must apply beforehand, and you must be prepared for a longish wait, even if your application meets with success. It is, in any case, out of the question to interview an astronaut about his family life or personal activities, Because all the astronauts have contracts with an American magazine under conditions for bidding any unauthorized disclosures about their private lives.
Certain obvious qualities are needed. Anyone who would be a spaceman must be in perfect health, must have powers of concentration( since work inside a spacecraft is exceptionally demanding)and must have considerable courage.
A. his own business and privacy
B. secrets as far as interviews are concerned
C. the property of an American magazine
D. the first-rate national confidential information

Today TV audiences all over the world axe accustomed to the sight of American astronauts in tip-top condition, with fair hair, crew-cuts, good teeth, an uncomplicated sense of humour and a severely limited non-technical vocabulary.
What marks out an astronaut from his earthbound fellow human beings is something of a difficult problem. Should you wish to interview him, you must apply beforehand, and you must be prepared for a longish wait, even if your application meets with success. It is, in any case, out of the question to interview an astronaut about his family life or personal activities, because all the astronauts have contracts with an American magazine under conditions forbidding any unauthorized disclosures about their private lives.
Certain obvious qualities are needed. Any would be spaceman must be in perfect health, must have powers of concentration (since work inside a spacecraft is exceptionally demanding) and must have considerable courage. Again, sp
A. his own business and privacy.
B. secrets as far as interviews are concerned.
C. the property of an American magazine.
D. the first rate national confidential information.

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, an uncomplicated sense of humour and a severely limited non-technical vocabulary.
　　What marks out an astronaut from his earthbound fellow human beings is something of a difficult problem. Should you wish to interview him, you must apply beforehand, and you must be prepared for a longish wait, even if your application meets with success. It is, in any case, out of the question to interview an astronaut about his family life or personal activities, because all the astronauts have con- tracts with an American magazine under conditions forbidding any unauthorized disclosures about their private lives.
　　Certain obvious qualities are needed. Any would be spaceman must be in perfect health, must have powers of concentration ( since work inside a spacecraft is exceptionally demanding) and must have considerable courage. Ag
A. his own business and privacy.
B. secrets as far as interviews are concerned.
C. the property of an American magazine.
D. the first rate national confidential information.