人感染卫氏并殖吸虫病主要是由于()
A.生食或半生食淡水鱼虾
B.生食或半生食淡水螺类
C.生食或半生食水生植物
D.生食或半生食石蟹
E.以上均不是
参考答案:D
It is the prevention of disease_____ its successful treatment that has led to the rapid increase of the world’s population.
A.more than
B.rather than
C.other than
D.less than
造成南稻北麦、南柑北苹、南蔗北菜(甜菜)的主导因素是[ ]
A、降水
B、光照
C、热量
D、地形