请认真阅读下面短文，从短文后各题所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。
People do not analyze every problem they meet．Sometimes they try to remember a solution from the last time they had a 36 problem．They often accept the opinions or ideas of other people．Other times they begin to act without 37 ; they try to find a solution by trial and error．However, when all of these methods 38 , the person with a problem has to start analyzing．There are six 39 in analyzing a problem．
First the person must recognize that there is a problem．For example, Sam’s bicycle is broken, and he cannot ride it to class as he usually does．Sam must 40 that there is a problem with his bicycle．
Next the person must 41 the problem．Before Sam can repair his bicycle, he must know why it does not work．For example, he must 42 the parts that are wrong．
Now the person must look for 43 that will make the problem clearer and lead to 44 ． solutions．For example, suppose Sam 45 that his bike does not work because there is something wrong with the brakes．At this time, he can look in his bicycle repair book and read about brakes, talk to his friends at the bike shop, or look at his brakes carefully．
After 46 the problem, the person should have 47 suggestions for a possible solution．Take Sam as an example 48 , his suggestions might be: tighten or loosen the brakes, buy new brakes and change the old ones．
In the end, one 49 seems to be the solution 50 the problem．Sometimes the 51 idea comes quite 52 because the thinker suddenly sees something new or sees something in a 53 way．Sam, for example, suddenly sees there is a piece of chewing gum stuck to a brake．He immediately hits on the solution to his problem: he must 54 the brake．
Finally the solution is 55 ．Sam does it and finds his bicycle works perfectly．In short, he has solved the problem．
36．A．serious B．usual C．similar D．common
37．A．practising B．thinking C．understanding D．helping
38．A．fail B．work C．change D．develop
39．A．ways B．conditions C．stages D．orders
40．A．explain B．prove C．show D．see
41．A．judge B．find C．describe D．face
42．A．check B．determine C．correct D．recover
43．A．answers B．skills C．explanation D．information
44．A．possible B．exact C．real D．special
45．A．hopes B．argues C．decides D．suggests
46．A．discussing B．settling down C．comparing with D．studying
47．A．exact B．enough C．several D．countless
48．A．once B．again C．also D．alone
49．A．suggestion B．conclusion C．decision D．discovery
50．A．with B．into C．for D．to
51．A．next B．clear C．final D．new
52．A．unexpectedly B．late C．clearly D．often
53．A．simple B．different C．quick D．sudden
54．A．clean B．separate C．loosen D．remove
55．A．recorded B．completed C．tested D．accepted