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The mummy of an Egyptian woman who died in 800 B.C. has just had an operation. The mummy is that of Shepenmut who was once a singer in the Temple of Thebes. As there were strange marks on the X-ray plates taken of the mummy, doctors have been trying to find out whether the woman died of a rare disease. The only way to do this was to operate. The operation, which lasted for over four hours, proved to be very difficult because of the hard resin which covered the skin. The doctors removed a section of the mummy and sent it to a laboratory. They also found something which the X-ray plates did not show: a small wax figure of the god Duamutef. This god which has the head of a cow was normally placed inside a mummy. The doctors have not yet decided how the woman died. They feared that the mummy would fall to pieces when they cut it open, but fortunately this has not happened. The mummy successfully survived the operation.
that 用以指代前面的 the mummy，以避免重复。在指代特指的事物时，尤其是在比较状语从句中，常用that 和those 指代前面提到的事物：
这里的生活费用比伦敦的要低。
The cost of living here is lower than that in London.
that of 和those of 一般用于较正式的文体中
美国的面积比英国的大。
The area of the USA is larger than that of Britain.
汤姆的笔比其他男孩的要好。
Tom's pen is better than that of the other boys.
