Solution: As shown in figure 1, A is the location of honey and B is the location of insects, that is, AC=BD=3CM.

After expansion, as shown in Figure 2, the rectangle MNQP is a cylinder side expansion diagram, connecting AB and BQ. From the meaning of the question, AB∨MP extends AB to E, PQ intersects E, △BEQ is a right triangle, and BQ is a demand. (Tips: Remember that the auxiliary line is a dotted line ~! )

From the meaning of the question, AB=9cm, AC=BD=PE=3cm.

∫PQ = 12cm，PE=3cm

∴EQ=9cm

Let BE=xcm (? 0≤x≤9cm)

In Rt△BEQ, BQ= under the radical sign (x squared +8 1).

The shortest distance

BQ = under the root sign (x squared +8 1)

When x is the smallest, BQ is the shortest.

∴ When X=0, BQ= radical number 8 1=9 (cm).

A: This bug has climbed at least 9 cm.

(If the place to climb Honey is 18CM) (I don't think the language in the question is very strict, just say how many centimeters you have to climb, which can be understood as how many centimeters you have to climb at least. )

Reason: because he may have climbed directly from below!

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