__5__Thankfully, dogs have an excellent sense of smell. A dog can smell a bone though it has been buried for years. Dogs can find bones buried by themselves as well as by other dogs. To the dog, whatever he finds is a treasure.

　　A．He must first find the perfect spot.

　　B．This can leave a backyard full of holes and bones.

　　C．Dogs use their nose to find a spot to bury their bones.

　　D．But there is actually a reason behind why dogs bury their bones.

　　E．Therefore, it's the dogs' instincts that tell them to bury their bones.

　　F．When dogs lived in the wild, sometimes there was not enough food.

　　G．Unfortunately, sometimes dogs do not always remember where a bone is buried.

　　答案：1～5　DFBAG

　　课时练(三)　第Ⅱ卷强化增分练(练规范)

　　(限时：45分钟)

　　Ⅰ.语法填空

　　(2016·甘肃省高三第一次诊断)On Thursday Mrs. Clarke locked the door and went to the women's club as usual.

　　When she came home she sensed __1__ unusual. Had anyone got in? The back door and the windows were all locked and there was __2__ sign of forced entry. Had anything been taken? She went from room to room checking and __3__ (find) her spare camera missing.

　　The following Thursday she went out at her usual time, but she just took a short walk in a park nearby, came home through the back door and settled down to wait and see what __4__ (happen)．

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