Ⅲ.综合运用

Clever Raccoons

Raccoons are very cute.It looks l__1__they are always wearing a mask.They are also quite clever.

Recently，some scientists tested a g__2__of raccoons.In the test，the raccoons were presented with cylinders（圆筒）.There was food f__3__on top of the water in the cylinders.But the food was too low for the raccoons to get.

The scientists showed the raccoons how d__4__stones into the water raised the water level.Two of the eight raccoons in the study repeated that action.Does this mean raccoons aren't clever enough?

Not at all！Actually，the other raccoons proved themselves to be c__5__problem solvers.Some of them c__6__onto the cylinder.They rocked it back and forth until it tipped over（倾倒）.Then they successfully got the food inside.Some others used other tools to collect the food.

The raccoons showed the scientists new s__7__.They are not only clever,but also creative.

1.l____________2.g____________3.f____________4.d____________5.c____________6.c____________7.s____________