题目

选词填空 ,根据短文内容，用方框中所给单词的适当形式填空。每词限用一次。 who, girl, photo, grandparent, mother Hello, I’m Grace. This is a 1. ______________ of my family. You can see six people in it. 2. __________ are these? They are my 3. __________. My grandpa is 60 and my grandma is 58. And who are these? They are my parents. My father is Peter and my 4. __________ is Betty. Who is the 5. __________? She is my sister Cindy. She is nice.15．已知向量$\overrightarrow{i}$，$\overrightarrow{j}$，$\overrightarrow{k}$是空间直角坐标系Oxyz中，x轴，y轴，z轴正方向上的单位向量且$\overrightarrow{AB}$=-$\overrightarrow{i}$+$\overrightarrow{j}$-$\overrightarrow{k}$，则B的坐标是（-1，1，-1）．