20. In which of the following sentences does the preposition " beneath " carry a metaphorical sense? ( )

64、The chairman of the company said that new techniques had( )improved their production efficiency.

63、The fact that the management is trying to reach agreement( )five separate unions has led to long negotiations.

62、We should always bear in mind that( )decisions often result in serious consequences.

61、The Olympic Games( )in 776 B.C.in Olympia, a small town in Greece.

60、The scientists have absolute freedom as to what research they think it best to( ).

59、She refused to( )the door key to the landlady until she got back her deposit.

58、More often than not, it is difficult to( )the exact meaning of a Chinese idiom in English.

57、Your advice would be( )valuable to him, who is now at a loss as to what to do first.

56、My cousin likes eating very much but he isn't very( )about the food he eats.

55、Much as( ), I couldn't lend him the money because I simply didn't have that much spare cash.