根据短文内容和所给的汉语提示，写出短文空白处各单词的正确形式，每空限填一词。
Miss White is from France. She can speak two____ (语言). She is a ____ (护士). She works in a ____ (医院)at night. She works very____ (努力). She likes to take a walk in a ____ (安静的) place. She likes ____ (动物) . She often goes to the zoo. Her cousin Bob is a reporter. He’s ____ （拍照）photos at the park . It’s____ (寒冷的) today. Look! Some people are swimming at the____ (泳池). Mr White is____ （感到惊讶的）to see it.

一只刚刚失去幼崽的猫，用自己的乳汁喂养了三只刚出生失去妈妈的小狗崽，“母子情深”宛如一家。对猫的这种行为的解释正确的是 （  ）
①是先天性行为 ②是学习行为 ③是由遗传物质决定的 ④是由环境因素决定的

往下图所示的烧杯中加入一种物质，轻轻搅拌后，粘在烧杯底部的塑料片脱落，加入的物质不可能是