【单选题】

Between 1900 and 1912, the nations ofEurope were at peace.But there were hostilities, rivalries, and conflicts brewing that would soon tear the whole continent apart. The great conflict was World War Ⅰ. (1) just prior to that war, there were two (2) conflicts in theBalkan PeninsulA、These two short wars took place in 1912 and 1913. Their (3) result was to end the (4) of the Turkish OttomanEmpire inEurope. The more tragic (5) of theBalkan Wars was to heighten the already fierce international tensions that were (6) the nations ofEurope toward World War Ⅰ.

In 1912 theBalkan nations (7) ofBosnia, Herzegovina, Montenegro, Serbia, Romania,Bulgaria, and Greece. The Macedonian region in northern Greece was under the (8) of the Turks. TheBalkan lands were also peopled by many intensely nationalistic ethnic groups.Among these were Serbs,Croats, Slovenes,Bulgars and Macedonians. These peoples had long been fierce rivals for territory and political (9) . Religious (10) between RomanCatholics andEastern OrthodoxChristians within these groups further added to their disputes. These rivalries still (11) .
Serbia,Bulgaria, Greece, and Montenegro formed theBalkan League in 1912. In October 1912 theBalkan League (12) war (13) the Ottoman Turks. TheBalkan (14) were quickly victorious. They won battles (15) Skopje, Monastir and other cities. The war ended inDecember. In May 1913 a treaty signed in London formally (16) the conflict. The Turks lost most of theirEuropean (17) .
(18) , the peace did not last. In June 1913Bulgaria attacked Serbia and Greece. This (19) conflict was ended by a (20) signed inBucharest inAugust 1913.
A．on
B．with
C．for
D．by