After all the difficulties, he has developed a habit of facing everything bravely, and is

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A. looking through
(答案→)B. going through
C. looking up
D. going up
解析：句意：在经历了所有的困难之后，他养成了勇敢面对一切的习惯，现在过着简朴但丰富的生活。go through:经受；仔细检查；通过；look through:浏览；温习；看穿；识破；look up:仰望；查阅；尊敬；go up:上升；上涨；故B正确。