下列地质构造属于断层一侧岩块相对下降的是（　　）

同学们课间经常打闹，有一次小明不小心将健康强壮的甲同学推到，使该同学的后脑撞击在了课桌角上，甲同学当时出现心跳，呼吸停止，尽管实施急救措施，但不幸的是，该同学永远地离开了人世，因此请同学们一定要注意玩闹时的安全，避免类似的悲剧再次发生．请问甲同学主要谁伤到了脑的哪个部位？（    ）

A: Betty, will we study at school in the future?

B: ____ But we don't use paper, pens or rulers.

A: What will we use?

B: ____

A: But will we use pencils in the art class?

B: ____ We will draw pictures on the computers.

A: ____ How long will we study at school every day?

B: I think we will study for about three hours and then we can play games.

A: Really?

B: ____ It's just my dream.

A: It's my dream too.

地球上终年炎热的地区是（     ）