Scientistsdoubtwhetherit’s________toregulateone’sbiologicalclockbydrinking.
A
A 可行的、可能且合理的 B 不可相信的、难以置信的 C 时髦的、时尚的 D 贵重的、宝贵的
PoorspeakerofEnglishthoughhewasatthetime,hestillmanagedtomakehimself________.
_______ in thought, he almost ran into the car in front of him.
China is a mountainous country.Hills,mountains,and plateaus cover _______ of the total area.
Whichofthefollowingisnotaninternationalvisitor?