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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,