30．Sheep on a remote Scottish island are gradually shrinking _______ global warming, according to a study published in the journal Science.

A. on account of　　 　　 B. by means of　　 　　　 C. in case of　　 　　　　　 D. in spite of

29．The long absence of rain _______ leads to a serious drought in the southwest of China, which draws the concerns of the whole country.　　

　A. immediately　　　 　　 B. accidentally　　 　　　 C. gradually　　 　　 　　D. undoubtedly

28．Over 800 pages of the earliest surviving Christian Bible have been recovered and made _______ on the Internet.

A. flexible　　 　　　　　　　 B. brilliant　　 　　　　　　 C. conventional　　 　　 D. available