单项选择题
There was a 0.3 per cent rise in the cost-of-living （）
A.mark B.grade C.indication D.index
单项选择题 On his back the man carried a heavy（）of old clothes.
单项选择题 Only the most sophisticated theories of modern physics can（）this phenomenon.
单项选择题 This is（）the most difficult job I have ever tackled.
