问题
单项选择题
下列哪一项不是使人群易感性降低的因素
A．传染病流行
B．易感人口的迁出
C．计划免疫
D．免疫人口的死亡
E．隐性感染后免疫人口增加
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
下列哪一项不是使人群易感性降低的因素
A．传染病流行
B．易感人口的迁出
C．计划免疫
D．免疫人口的死亡
E．隐性感染后免疫人口增加
参考答案：D
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41～60各题所给的四个选项（A.B.C和D）中，选出最佳选项，并在答题纸上将该选项标号涂黑。 Jack Baines is a self-made millionaire, but his beginnings were very lowly. He was the youngest of eight children. His father had a 41 in a cotton mill (纱厂), but he was often 42 to work because of poor health. The family couldn’t 43 to pay the rent or bills, and the children often went 44 . After leaving school at the age of 14, Jack was 45 what to do when Mr Walker, his old teacher, offered to lend him ￡100 to start his own 46 . It was just after the war. Raw materials were not enough, and Jack saw a 47 in scrap metal(废弃金属). He bought bits of metal and stored it in an old garage. When he had built up a large amount, he sold it and 48 plenty of money. Jack 49 working hard. After one year he succeeded in 50 the ￡100. By the time Jack was 30 years old he had 51 his first million, and he wanted to 52 this achievement by doing something “ 53 ”. With all his money it was 54 to build a beautiful home for himself and his parents. In 1959, “Baines Castle” was built in the 55 of the Lancashire countryside. It was one of the finest buildings in the country. Jack has recently sold “Baines Castle” for ￡500 million, 56 Jack still can’t get used to 57 the good life. He can 58 be found drinking with the locals at the local pub（酒吧）. “I remember being very 59 as a child, but never 60 as a child,” says Jack, “and I will never forget where I came from and who I am.”
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