问题
单项选择题
关于梅毒螺旋体的致病性与免疫性的叙述正确的是( )
A．人不是梅毒的唯一传染源
B．致病因素有内毒素和外毒素
C．先天梅毒由母亲垂直传给胎儿
D．后天梅毒的传播途径主要是接触
E．机体抗梅毒螺旋体的免疫为传染性免疫
答案
参考答案：E
解析： 先天梅毒由母亲经胎盘传给胎儿。
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关于梅毒螺旋体的致病性与免疫性的叙述正确的是( )
A．人不是梅毒的唯一传染源
B．致病因素有内毒素和外毒素
C．先天梅毒由母亲垂直传给胎儿
D．后天梅毒的传播途径主要是接触
E．机体抗梅毒螺旋体的免疫为传染性免疫
参考答案：E
解析： 先天梅毒由母亲经胎盘传给胎儿。
The students at Sandy's high school were badly shaken by the news that a classmate had __36 himself．The suicide note read: “It’s hard to 37 when nobody cares.” Glen, a teacher, realized this was a 38 moment about the importance of making people feel _39 ． He asked his class to imagine they were about to _40 and to write a note "telling someone how and why you _ 41 him or her." Sandy, who had a 42_ relationship with her mother, decided to write her _43 . Her letter read: "We've had some 44_ times and I haven't always been a very good _ 45 , but I know I'm lucky to have you in my life． You're the _ 46_ person I've ever known．And even when I disagree with you, I never _ 47 _you love me and want what's best for me．Thanks for not 48 up me.” When her mom read the note, she cried and hugged Sandy 49 but said little． The next morning, Sandy found a 50 on her mirror: "Dearest Sandy, I want you to know being your mother is, by far, the most important thing in my life． 51_ I got your note , I thought I had lost your love and 52 . I felt like such a failure．I intended to 53 it all last night．Your note saved my 54 .” Be careful not to underestimate(低估) the 55 of expressed appreciation. It won't always save a life, but it will always make someone's life better．
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