_______（50）A.The ray penetrated every one of them
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_______（50）
A.The ray penetrated every one of them except the key
B.She was very surprised by this request
C.how then could any ray penetrate
D.It was a great invention
E.Other uses came later
F. Doctors quickly saw how this could be used
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答案：E
“其他用途随后出现”是承上启下句。前一句为“The most obvious use for this discovery was to enable doctors to see exactly how a bone was fractured"，该句后面细述它的用途。