To prevent dental disease, we should take a range of______of Vitamin C per day.A．25-2,000

What can we do to prevent the disease spreading？（英译中)

Dental and oral diseases are common in both adults and children.A．RightB．WrongC．Not mentio

To prevent a repetition of this dreadful occurrence, we must discover the ______ element i

According to the speaker, what should we do to prevent a population explosion？A．To take ac

We learn from the news that Endeavour will be sent to _____ after its return.A．a public sh

We must take precautious measures to prevent the river______.A．to be pollutedB．from pollut