4. Frank is able to dance well. A: redundancy B: wordy C: unneeded modifiers D: weak verb

What is the main problem with this sentence?<br/>Frank is able to dance well. A: redundancy B: wordy C: unneeded modifiers D: weak verb

How to achieve conciseness of sentences according to the video clip? A: Write short sentences. B: Avoid writing involved sentences. C: Deleting all the unneeded words in the sentences. D: Using the least number of words to write sentences.

The last sentence means that a knowledge of fish sounds can help man to （）. A: avoid confusion in fishing activity B: avoid unneeded effort in fish sound studies C: detect enemy submarines D: pick up new sounds