某些可引起人类传染病的病原体在自然界的野生动物中长期存在和循环的地区是()
A.病媒生物
B.菌种、毒种
C.病原携带者
D.自然疫源地
E.人畜共患传染源
参考答案:D
阅读下列各小题,根据括号内的汉语提示,用句末括号内英语单词的适当形式完成句子。
小题1:We all know our school year __________________________(划分成)two semesters.(divide)
小题2:Now my parents _____________________(引以为豪)my great progress in English.(proud)
小题3:He is very interested in novels which _____________________(与……有关系的)school life. (relate)
小题4:To Robin’s disappointment, his father only _____________________(在乎)the result of his exam now. (care)
小题5:I_____________________(对……印象深刻)the speech that he made about protecting animals. (impress )
克拉克认为,劳动力在各产业间的转移是由什么造成的().
A.各产业附加值相对差异
B.劳动者就业喜好
C.政府政策
D.各产业产出水平