下列计算正确的是（     ）

福寿螺是一种危害极大的外来物种．如图是防治福寿螺的稻鸭生态农业模式．请回答：

请指出下列四条食物链中，正确的是         (     )

2013年4月，一则“法国归还兽首”的消息让国人振奋。但世界上现存最早的有明确时间记载的印刷品仍流落在英国伦敦的大英博物馆（　　）

根据短文内容，选择所给词的适当形式完成短文。                

The most important person in the world is your mother. She looks after you all the ____ .On cold winter days, she always tells you ____on more clothes. She always stands in the wind waiting for you back from school every day. When you hurry to leave home for school without breakfast, she always feels ____  about you at home. She knows about your study and spends much money ____ your school things. Mother can do everything for you day after day. What ____  love that is in the world! We’ll always remember mother love.