Beijing was under an “orange” smog alert on Feb. 24, which marks the first time the second-highest warning level of a new system introduced last year_______.
---Why are so many northern Chinese visiting Southeast Asia countries recently? ---They are trying to get a ________ shelter from the cold weather in winter.
“The Mozart effect” is a study described in 1993 in Nature _______ aroused public interest about the idea _______ listening to a classical music somehow improves the brain.