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Verbal·Expression of Ideas·Transitions

easy

Scientists were able to isolate a relatively pure sample of cadmium in 1817, the same year they first discovered the element’s existence.       , the isolation process took longer for thallium, which was isolated in its pure form 43 years after scientists discovered it.

Which choice completes the text with the most logical transition?

A

For instance,

B

Thus,

C

However,

D

By contrast,