练习题：
1.The sun's appearing to rise in the east is _____ the revolution of the earth on its axis from west to east.
A.owe to B.due to C.as to D.as for
2. She always put her medication on the top of the shelf lest the children
______ it by mistake.
A. took B. should take C. had taken D. would take
参考答案：
1.B。
太阳似乎从东方升起是因为地球绕着地轴自西向东运转。
owe是动词，常用作owe to意为“把....归于....”，“靠....而”;due to表示原因;as to,as for就.....而论，至于。用于对谈过的事作进一步的说明或介绍新话题，放在句首。
2.B
她总是把自己的药放到搁架上以免孩子错拿。lest意为“以免”，后接虚拟语气should+动词原形。
