--Do you think it true that all the theories should ________ facts?

--I don’t suppose so. If so, there would be no predictions(预言)

　 A. be made on　 　B. be based on　 　　　C. be set up with　 　　D. be built with

  --Do you think it true that all the theories should ________ facts?

  --I don’t suppose so. If so, there would be no predictions(预言)

   A. be made on    B. be based on   C. be set up with   D. be built with

完形填空

　　A successful scientist is generally a good observer. He makes full 1 of the facts he observes. Hedoesn't accept ideas which are not 2 on obvious facts, and therefore refuses to accept authority (权威) as the only 3 for truth. He always 4 ideas carefully and makes experiments to prove them.

　　The rise of 5 science may perhaps be considered to 6 as far back as the 7 of Roger Bacon, the wonderful philosopher of Oxford, who lived 8 the years 1214 and 1292. He was probably the first in the Middle 9 to suggest that we should learn science 10 observing and experimenting on the things around us, and he himself 11 many important discoveries.

　　Galileo, however, who lived more than 300 years later, was the greatest of several great men, 12 lived in Italy, France, Germany, or England, and began by 13 to show how many important 14 could be discovered by observation. Before Galileo, learned men believed that large bodies fell more 15 towards the earth than small ones, 16 Aristotle said so. But Galileo, going to the 17 of the leaning Tower of Pisa, let fall two 18 stones and proved Aristotle was wrong. It was Galileo's 19 of going direct to Nature, and proving our 20 and theories by experiment, that has led to all the discoveries of modern science.