The invasion (入侵) of desert locusts (蝗虫) that has already thrust millions of Africans into 1________ may pose threats to China's southern regions this summer. Y unnan and Sichuan provinces, as well as the Guangxi Zhuang 2______ region, are most likely to be affected, according to Zhang Zehua, a researcher at the 3______of Plant Protection of the Chinese Academy of Agricultural Sciences. "It is extremely unlikely that desert locusts will directly4______into China's inland areas, but if the overseas desert locust plague( 灾祸) persists, the 5______ of locusts entering China in June or July will 6______increase," Zhang said. According to the United Nations, the desert locust is among "the most dangerous migratory 7____ in the world". A single locust can travel 8_____ kilometers, and a small swarm (一大群) can consume enough food to feed 9_____ people in one day.