21. There is no doubt that the Diaoyu Islands are _______ part of China and what some Japanese have done recently is actually ________ offence against Chinese people.

A. a; /        B. a; the           C. the; /          D. /; an

22. The drilling in Antarctica dragged on slowly because of lack of money, equipment breakdowns, environmental ______ and severe cold.

A. concerns      B. assumption          C. occupations             D. ignorance