Fluency in a foreign language is often thought to be about speaking quickly and using advanced vocabulary. However, researchers reveal that speakers who use common, everyday expressions sound more fluent than those who rely on rare, complex words. There is a study that highlights the importance of mastering familiar phrases to improve fluency perception, suggesting that learners should naturally incorporate common formulaic expressions in spontaneous speech. 

    The findings revealed that utterance fluency (smoothness of speech delivery) was the strongest predictor of fluency perception, accounting for 61% of the variance in ratings. However, high-frequency formulaic expressions added an extra 0.8% to fluency judgments, while rarer, more complex phrases had little to no effect. 

     This research suggests that learners should shift their focus from advanced vocabulary to mastering everyday phrases that come naturally in conversation. For example, instead of saying "I concur with the idea" — which sounds unnatural — learners should use "I agree with the idea." These common expressions are easy to find in textbooks and everyday conversations, making them more accessible for learners of all levels. 

Internet: <https://sciencedaily.com>(adapted).

Based on the preceding text, evaluate the following item.