如图示某农业生态系统部分物质循环过程．该系统获得了鱼、猪、蚕和粮食的全面丰收．下列相关叙述错误的是（　　）

A: —I'm ____ (sad; excited) because we're going to climb the mountain.

B: —That's ____(grey; great).

A: —I'm ____(scared; tired).

B: —Why are you scared?

A: —Because she's going into the cave. I heard a____ (toys; noise).

B: —Be careful!

十月怀胎不容易，我们要尊敬自己的母亲．请问人的胚胎发育场所是（   ）