根据下面资料，回答1-20题
Why do we have the political opinions we have and not another? How and why do our 1 change? The answers to these questions are complex. Differences of opinion are shaped by 2 life experiences：where you live；how you were 3 ；whether you're rich or poor. Emotion comes into the picture, and emotion has a 4 basis, at least in part. All of this and more combines into a mixed dish 5 a fixed recipe, even if many of the ingredients are known.
Surprisingly, a recent experimental psychology suggests, our political beliefs may have 6 to do with a specific aspect of our biological makeup. In the mid-2000s, a political scientist 7 the neuroscientist Read Montague with a radical proposal—political orientation might be partly inherited, and might be 8 by our physiological reactivity to threats. To test their theory, they wanted Montague, who 9 the Human Neuroimaging Laboratory at Virginia Tech, to scan the brains of subjects 10 they looked at a variety of images—including ones displaying disgusting scenes 11 badly injured animals and dirty toilets—to see whether neural responses showed any12 with political ideology.
Montague 13 laughed at the idea, but the team returned with studies to argue their case, and eventually he signed on. 14 the data began rolling in, any skepticism about the project quickly 15 . The subjects, 83 in total, were first shown a random 16 of neutral and emotionally provocative pictures—this second category contained both positive and negative images—while 17 brain scans. Then they filled out a questionnaire seeking their views on hot-button political and social issues, in order to classify their general outlook on a 18 from extremely liberal to extremely conservative. As Montague mapped the neuroimaging data against ideology, he recalls, "my jaw dropped." The brains of liberals and conservatives reacted in wildly different ways to 19 pictures: Both groups reacted but different brain networks were stimulated. Just by looking at the subjects' neural responses, in fact, Montague could 20 with more than 95 percent accuracy whether they were liberal or conservative.
第（14）题选

A Since

B Now that

C When

D Then