题目

下列命题:①公理1可用集合符号叙述为:若A∈l,B∈l,且A∈α,B∈α,则必有l∈α;②四边形的两条对角线必相交于一点;③用平行四边形表示的平面,以平行四边形的四条边作为平面边界线;④梯形是平面图形.其中正确的命题个数为（    ）A.1                 B.2                   C.3                       D.4 第二节  完形填空（共20小题；每小题1.5分，满分30分） 阅读下面短文，从短文后所给各题的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。 It was a winter morning, just a couple of weeks before Christmas．While most people were  31  their cars, Trevor, my husband, had to  32  early to ride his bike four kilometers away from home to work．On arrival, he  33  his bike outside the back door as he usually does．After  34  10 hours of labor, he returned to find his bike  35  . The bike, a black Kona 18 speed, was our only tool．Trevor used it to get to 36  , putting in 60-hour weeks to  37  his young family．And the bike was also used to get groceries， 38  us from having to walk long distances from where we live． I was so  39  that someone would steal our bike that I wrote to the newspaper and told them our story．Shortly after that, several people in our area   40  to help．One wonderful stranger   41  bought a bike, then called my husband to pick it up． 42  my husband had a way to get to and from his job．It really is a（an）  43   that a complete stranger would go out of their way for someone they have never met before．People say that a smile can be  44  from one person to another, but acts of kindness from  45  are even more so．This experience has had a spreading effect in our lives because it  46  our faith in humanity as a whole．And it has   47  us to be more mindful of ways that we, too, can  48  with others．No matter how big or how small, an act of kindness shows that someone  49  ．And the results can be   50  ．   31．A．cooling down       B．warming up   C．speeding up        D．slowing down 32．A．get up              B．wake up       C．turn up           D．rise up 33．A．piled               B．pushed          C．parked            D．paused 34．A．putting in         B．putting on              C．putting off      D．putting away 35．A．broken             B．robbed          C．hidden            D．gone 36．A．study               B．shop          C．work          D．deliver 37．A．live                B．support         C．serve           D．protect 38．A．getting             B．protecting     C．saving            D．allowing 39．A．surprised            B．thrilled         C．puzzled           D．sad 40．A．offered              B．supported      C．provided         D．supplied 41．A．still                B．finally          C．even            D．yet 42．A．Now and then        B．Once in a while C．Once again        D．Sooner or later 43．A．honor               B．pity          C．sympathy       D．respect 44．A．thrown              B．passed        C．sent            D．got 45．A．friends                  B．strangers        C．relatives        D．parents 46．A．weakened            B．spread           C．reduced         D．strengthened 47．A．moved                  B．forced           C．urged            D．influenced 48．A．share            B．connect          C．deal           D．work 49．A．likes                B．cares          C．worries         D．wonders 50．A．short              B．promising      C．permanent        D．temporary