根据以下材料，回答1-20题
Today's politicians seem more comfortable invoking God and religion than they do presenting facts or numbers.Of course, everyone is 1 to his or her own religious beliefs. 2 when science and reason get short-changed, so does America's future.As we 3 toward the next election, it's important to keep an 4 on how our political leaders view science and its advances, because their attitudes frequently 5 their approaches toward rational decision-making itself.
When Rick Perry says evolution is merely"a theory that's out there, it's got some 6 in it," he's 7 a fundamental misunderstanding of scientific theory.And when he chooses to pray for the end of a drought 8 critically evaluate climate science, he is displaying the danger of 9 rational approaches with religion in matters of public policy.
What we are seeing in the current presidential race is not so much a/an 10 between religion and science as a fundamental disregard 11 rational and scientific thinking.All but two of the Republican front runners won't even consider that man-made global warming might be causing climate change, 12 a great deal of evidence that it is.We know CO₂ warms the planet through the greenhouse effect, and we know humans have 13 a huge increase in CO₂ in the atmosphere by burning coal and oil. 14 man-made climate change is not proved with 100% certainty does not 15 its dismissal.
16 , an important part of science is understanding uncertainty.When scientists say we know something, we mean we have 17 our ideas with a degree of accuracy over a range of scales.Scientists also 18 the limitations of their theories and define and try to extend the range of 19 .
When the method is applied properly,the right results 20 over time.
第13题答案是

A introduced

B created 

C summoned

D triggered