D=LEC打分方法属于（）的风险评价方法。
A、定性
B、相对
C、概率
D、故障树
参考答案：A
Mr. Green has made another wonderful discovery, ______ great
importance to science.
A．which I think is of
B．which I think it is of
C．that I think is of
D．I think which is of
卢浮宫在（）年正式对外开放。
A.1773
B.1783
C.1793
