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Verbal·Expression of Ideas·Transitions

easy

The tiny transistors that control the flow of electricity in modern devices may one day be made of wood. Researchers in Switzerland have found a way to use heat and chemicals to widen the grooves in dry pieces of balsa wood. __________ these grooves become wide enough that electrical conductors can be passed through them.

Which choice completes the text with the most logical transition?

A

As a result,

B

In contrast,

C

Previously,

D

For example,