关于四幅图中阴影地区特征的叙述，正确的是 （    ）

    Mary likes to invent things. She creates a new language and teaches it to her friend, Jean. Mary and Jean like to talk to each other in their own language because they think no one understands them and it is funny. When they go shopping, they say things like: "Look! He is fat.” “This CD is awful." "I want to eat free hamburgers.”A clerk comes but he can't understand what they say. He asked them: “May I help you?”Mary and Jean just laugh. What fun it is to create something new.

              可以把我们的学习成果不断的装进去，记录下我们成长的脚印。（     ）

下列除杂（括号内的是杂质）所选试剂合理的是（）

—He ________ a model ship.