更多"Avian flu or H5N1 has infected more"的相关试题:
[填空题] Avian flu or H5N1 has infected more than a hundred people so far in at least ten countries. The virus in Asia is killing more than 50% of the humans infected. If this virus learns to (36) ______human to human and (37)______that level of killing humans, we’’d got a global (38)______. Under (39)______ microscope, flu viruses look like spiky creatures. H5N1 may seem unassuming in the lab, but be sure it has ability to cause a public health (40)______. In fact experts say that H5N1 (41)______ strain responsible for the 1918 Flu pandemic. That strain mutated to (42)______ between people and (43)______. killed as many as 15 million around the world. (44)____________. But scientists warn that H5N1 could change to become an explosive killer. (45)____________ Here’’s what I mean. Let’’s say that the chicken farmer has the regular flu which always spreads like a wild fire from person to person. Then he gets infected with H5N1 from one of his chickens. Now both viruses are in the cells wh