The World Health Organization(WHO) has made an appeal to scientists, drug manufacturers and governments. The WHO wants them to work together     1    (develop) drugs to fight 12 bacteria. These bacteria     2    (be) able to resist     3    (power) antibiotic(抗生素) drugs. The resistance is so unusually strong that all the 12 bacteria have been given a special name “superbug”．

The United Nations agency reported this week the 12 superbugs are a threat to human     4    (healthy). It said they have     5    ability to easily turn treatable infections into killers. The WHO says superbugs can also pass along genetic material     6    helps other bacteria become resistant to drug treatment.

Marie­Paule Kieny is the Assistant Director­General at the WHO. She said, “Antibiotic resistance is growing and we are fast running out     7    treatment options.” She urged governments to give drug companies reasons to develop new treatments. “If we leave it to market forces alone, the new antibiotics we most     8    (urgent) need are not going to be developed in time，” she said.

Antibiotic drugs can lose their effectiveness when people take more or less than the amount     9    (require) by doctors. When this happens, infections that     10    (treat) at one time easily become resistant.