问题 单项选择题

霍乱的发病机制中,起主要作用的是

A.侵袭力

B.肠毒素

C.神经节苷脂

D.内毒素

E.cAMP

答案

参考答案:B

解析:霍乱是由霍乱弧菌所致的烈性传染病,病理变化主要由霍乱弧菌产生的肠毒素引起。

改错题

第二节:短文改错(共10小题;每小题1. 5分,满分15分)

此题要求改正所给短文中的错误。如有错误(每行只有一个错误),如无错误,在答题卡相应的位置上画一个勾(√);如有错误(每行只有一个错误),则按下列情况改正;

此行多一个词:把多余的词写在答题卡相应的位置上,用斜线(﹨)划掉。

此行缺一个词:在答题卡相应的位置上写出该加的词,并附带前(后)词。

此行错一个词:在答题卡相应的位置上写出该错词和改正后的词。

注意:原行没有错的不用改。

A 60-year-old Australia woman jumped onto the back                        76. ___________

of a 4-metre crocodile stop it from killing a 34-year-old                  77. ___________

man. The crocodile grabbed one man as he was sleeping                   78. ___________

in a tent at a beaches campsite in Australia. The crocodile                79. ___________

entered the tent around 4 a. m. Monday and dragged                       80. ___________

the man outside. The woman, that was camping nearby, saw             81. ___________

what was happening and jumping onto the crocodile. The crocodile 82. ___________

then let the man go and turned on the woman, pulling him                      83. ___________

towards the water. Luckily a third person shot                                 84. ___________

the crocodile death just in time, saving the woman.                          85. ___________

单项选择题