单项选择题
The discovery of these tombs is （） for scholars' studying Chinese history.
A．of very important B．great significant C．of great significance D．greatly importance
单项选择题 She became the first woman to enter the school but withdrew after a few days （） stress.
单项选择题 This new machine is technically far （） to the previous type.
单项选择题 （） is known to us all is that the 2012 Olympic Games will be held in London.
