64.Which of the following prepositional phrases is an adverbial of concession? ( )

78、Mr. Brown's condition looks very serious and it is doubtful if he will( ).

77、Taking photographs is strictly( )here, as it may damage the precious cave paintings.

76、The heat in summer is no less( )here in this mountain region.

75、The president explained that the purpose of taxation was to( )government spending.

74、Professor Johnson's retirement( )from next January.

73、The majority of nurses are women, but in the higher ranks of the medical profession women are in a( ).

72、Thousands of people turned out into the streets to( )against the local authorities' decision to build a highway across the field.

71、His ideas are invariably condemned as( )by his colleagues.

70、The director tried to get the actors to( )to the next scene by hand signals.

69、We realized that he was under great( ), so we took no notice of his bad temper.