他们知道圣诞老人是真实存在的，而文中说的正好相反。B项说他们让他们的妈妈把礼物放在他们的袜子里，完全不正确，是他们的爸爸自己把礼物放在他们袜子里的。C项说他们知道圣诞老人是他们的爸爸，这句是正确的。D项说他们知道圣诞老人真的是他们的朋友，文中没有提到朋友的内容。所以答案选C。
　　45．A[解析]根据第二段Hegetstothetopofeachhouseandclimbsdownthechimneyintothefireplace．知道圣诞老人是从烟囱里钻进房子的。所以答案选A。
　　46．C [解析]根据Whenwereturnedtoschool，myteachertoldmeto…可知，当“我”回到学校以后，才得知母亲生病的消息，故C正确。
　　47．D[解析]根据Thepoliceofficertoldmewhathadhappenedand…可知，警察告诉“我”发生了什么事，故答案选D。
　　48．B [解析]在短文的第三段开头讲到Theheadmastercameandtoldmytwoteacherswhathadhappened．然后紧接着妹妹说出了：She’sgone．Teresa，mommy’sgone．She’sdead．我们可以推出校长告诉老师的事是Mymotherhadbeendead．故B为正确选项。
　　49．B [解析]通过Whensomeoneasksmewhomyherois，Itellthem，mymother．Mymotherliveseveryday．Thatiswhatmakesheratruehero．可以推知作者以母亲为骄傲，故答案选B。
　　50．D[解析]通过最后一段Mymotherwasastrongmother，whohadthebiggestheart．可以推知在作者心中母亲很great(伟大)，D项最为恰当。
　　Ⅳ．根据短文内容回答下列问题
　　51．Annalivedonthesideofavalley．
　　52.No,itwasn't. ~
　　53.Five.
　　54. Because she had already four/ a lot of children to support. /Because life would be even harder when another family joined them. / Because she/her family was poor ... (意思对即可)意思对即可)
　　55.AttheendoftheFirstWorldWar.
　　56.Anna.
　　57.Becauseshewasoncehelpedbythepoor./Thepooroncehelpedher.(意思对即可)
　　V．短文改错
　　58.writing后加to
　　59.去掉an
　　60.getting-get
　　61.friend-friends
　　62.√
　　63.her-him
　　64.has-have
　　65.this-it
　　66.去掉but
　　67.quietly-quiet
　　Ⅵ．书面表达
　　68. To have one morning a week to have spoken English lessons. / Have one morning a week to have spoken English lessons.
　　69. To have more fashionable school uniforms. / Having more fashionable school uniforms.
　　70. To take a nap. / Take a nap.
　　71. Do their homework.
　　72. 15 (years old).
　　I agree with you. But I'll ask some teachers to make a questionnaire (do a survey) first. If more than 70% students have the same ideas as yours I'll make the lunch time longer.
　　But I'm sorry that it's impossible for us to have one morning every week to practice speaking English. We have time for all your subjects. You should make good study plans to improve yourself.
　　And I can't agree to have more fashionable school uniforms. Since wearing uniforms is a rule in our school, the uniforms had better be simple.