题目

阅读理解 Renowned British physicist Stephen Hawking died peacefully at his home in the British university city of Cambridge in March 14 at age 76. Hawking, whose 1988 book “A Brief History of Time” became an unlikely worldwide bestseller and cemented (奠定) his superstar status, dedicated his life to unlocking the secrets of the Universe. He held the post of Lucasian Professor of Mathematics at the University of Cambridge, which is a position that was once held by Sir Isaac Newton. Born in 1942 in Oxford, where his parents spent the final months of pregnancy to avoid the bombings of 要想使气体液化可以采用________和________两种方法．