TOEFL Listening: TPO-TOEFL听力TPO - 1FBJ53YG7I58C41DR$

What characteristic of element 43 might explain why the scientific community doubted the findings of Ida Tacke's team? A. Element 43 has a very fast rate of decay B. Element 43 always contains small amount of other elements C. Element 43 cannot be created artificially D. Element 43's radioactivity makes it easy to isolate and measure