第二节：完形填空（共20小题；每小题1分，满分20分）
阅读下面短文，掌握其大意，然后从36—55各题所给的四个选项（A、B、C和D）中，选出最佳选项
People who are cheerful and relaxed are less likely to suffer from colds．It's   36   that being full of vim（活力） and vigor（精力） helps the body   37   illnesses, say the researchers from Carnegie Mellon University（CMU） in Pittsburgh．
"We need to take more seriously the possibility that a   38   emotional style is a fighter player in disease risk," says psychologist Sheldon Cohen, the study's lead researcher．
In a previous study, Cohen and his colleagues found that people who   39   to be cheerful and lively were   40   likely to develop sniffles, coughs, and other cold symptoms （症状）．
Those findings were interesting, but they didn't prove that a person's   41   affects whether he or she gets sick． 42   it was still possible that a person's underlying personality is   43   matters．
44   suggests, for instance, that certain people are naturally more likely to be outgoing（外向的）and   45  , with high self-respect and a sense of  46   over life．This would mean that who we are, not how we feel, finally decides our   47   of catching colds．
To figure out which mattered more （personality or   48 ）, the CMU team   49   193 healthy adults．The researchers talked to each person over the phone every evening for 2 weeks．They told the researchers about the positive and negative   50   they had experienced that day．
The results showed that everyone in the study was   51   likely to get infected．Their symptoms（征兆）, however,   52   depending on the types of emotions that they had reported over the   53   2 weeks．
Scientists   54   about whether negative emotions or positive emotions have a stronger  55   on how healthy we are．For now, it can't hurt to look on the bright side more often than not!
36．A．necessary         B．possible           C．doubtful         D．certain
37．A．fight               B．reduce             C．stop                 D．remove
38．A．negative          B．standard           C．passive            D．positive
39．A．failed                     B．managed          C．tended             D．had
40．A, most                 B．least                C．quite               D．indeed
41．A．thought           B．attitude            C．strength           D．quality
42．A．Instead            B．Therefore         C．Thus                D．Still
43．A．that                 B．why                C．what                D．who
44．A．Theory            B．Reason            C．Evidence         D．interview
45．A．active              B．optimistic        C．brave               D．healthy
46．A．control            B．humour           C．direction          D．urgency
47．A．attitudes          B．sufferings        C．chances            D．emotions
48．A．qualities          B．ideas               C．emotions          D．conditions
49．A．examined         B．watched           C．tested                     D．interviewed
50．A．characters        B．feelings           C．attitudes           D．thoughts
51．A．equally            B．less                 C．most                D．hardly
52．A．occurred          B．differed           C．suffered           D．reduced
53．A．same               B．exact               C．valuable           D．previous
54．A．talk                 B．know               C．argue               D．think
55．A．effect                     B．feeling             C．impression       D．impact