小科同学家里有一金属块，不知由什么金属制成。小科为了测定它是何种金属，进行了如下实验：先用细线吊着金属块挂在弹簧测力计上，弹簧测力计的示数如图甲所示，然后将金属块浸没在水中，弹簧测力计的示数如图乙所示。
A：How was your last Sunday，Sam?
B：____ I really had a good time.
A：____
B：I played pingpong with my father.What about you?
B：Oh.You're really hardworking！ ____
A：Yes，of course.I saw a film with my cousin on Sunday night.
B：Really？ ____
A：Yes.It was about dinosaurs.It was very interesting.
A．I did my homework.
B．Did you do anything else?
C．What did you do?
D．Did you enjoy the film?
E．It was great.
“种瓜得瓜，种豆得豆”这种现象主要取决于下列哪一结构（ ）
