条件致死突变（conditional lethal mutation)
条件致死突变（conditional lethal mutation)
The chemical is lethal to rats but safe to cattle. A: toxic B: harmful C: deadly D: contagious
The chemical is lethal to rats but safe to cattle. A: toxic B: harmful C: deadly D: contagious
That airplane crash dealt a _____ blow to this airline company. A: light B: lethal C: important D: subtle
That airplane crash dealt a _____ blow to this airline company. A: light B: lethal C: important D: subtle
ED50 means A: Median effective concentration B: Median toxic dose C: Median lethal dose D: Median effective dose
ED50 means A: Median effective concentration B: Median toxic dose C: Median lethal dose D: Median effective dose
Cambridge English Corpus defines 'euthanasia' as: "There may be many intentions present in a single action, and in complex actions such as euthanasia and lethal palliation there typically are."
Cambridge English Corpus defines 'euthanasia' as: "There may be many intentions present in a single action, and in complex actions such as euthanasia and lethal palliation there typically are."
What can be inferred about the effective volcanic ash on people (). A: It’s lethal upon contact. B: It has relatively little harmful effect. C: It affects the sense of hearing.
What can be inferred about the effective volcanic ash on people (). A: It’s lethal upon contact. B: It has relatively little harmful effect. C: It affects the sense of hearing.
The life cycle of virulent phages that always kill their host cell and never become inactive prophages would be the _____ cycle. A: lethal B: lytic C: temperate D: strict E: lysogenic
The life cycle of virulent phages that always kill their host cell and never become inactive prophages would be the _____ cycle. A: lethal B: lytic C: temperate D: strict E: lysogenic
Many smokers believe that e-cigarettes can help them quit smoking. _____________, scientific researches show that e-cigarettes are more addictive and lethal than traditional cigarettes. A: In addition B: However C: As a consequence D: Equally important
Many smokers believe that e-cigarettes can help them quit smoking. _____________, scientific researches show that e-cigarettes are more addictive and lethal than traditional cigarettes. A: In addition B: However C: As a consequence D: Equally important
The ____1____（novelty）coronavirus(冠状病毒) has much in common ____2___ seasonal flu.They are both viral infections, share similar symptoms and crucially(关键地） can spread from human to human. In the midst of flu season in much of the northern hemisphere, ____3___(tell) the difference between the two will be vital in stopping its spread. Human coronaviruses, of which there are four, can cause respiratory (呼吸道)infections similar to flu: while many symptoms are mild, both can lead to pneumonia（肺炎） and become lethal（致命的）. ___4___, the novel coronavirus is more serious than __5__ "typical influenza infection,(流感)"says Ian Jones, a professor of virology at the University of Reading. "This virus appears to go___6___(far) down into the lungs than would generally be the case. Therefore, it will give you___7___ (symptom) of pneumonia(肺炎): the lungs becoming flooded, they don't function very well and the patient gets into breathing difficulty." While the mortality rates and symptoms of flu and novel coronavirus may end up being similar, humans' ability ___8____(fight) off the viruses differs greatly. Humans have naturally built up antibodies to seasonal flu and annual vaccines____9____(develop) to fight it. During a pandemic (流行病), which the new coronavirus has the potential to become, "there is no immunity (免疫性) in the population so you have potential for a ___10___(globe) spread," warns Jones.
The ____1____（novelty）coronavirus(冠状病毒) has much in common ____2___ seasonal flu.They are both viral infections, share similar symptoms and crucially(关键地） can spread from human to human. In the midst of flu season in much of the northern hemisphere, ____3___(tell) the difference between the two will be vital in stopping its spread. Human coronaviruses, of which there are four, can cause respiratory (呼吸道)infections similar to flu: while many symptoms are mild, both can lead to pneumonia（肺炎） and become lethal（致命的）. ___4___, the novel coronavirus is more serious than __5__ "typical influenza infection,(流感)"says Ian Jones, a professor of virology at the University of Reading. "This virus appears to go___6___(far) down into the lungs than would generally be the case. Therefore, it will give you___7___ (symptom) of pneumonia(肺炎): the lungs becoming flooded, they don't function very well and the patient gets into breathing difficulty." While the mortality rates and symptoms of flu and novel coronavirus may end up being similar, humans' ability ___8____(fight) off the viruses differs greatly. Humans have naturally built up antibodies to seasonal flu and annual vaccines____9____(develop) to fight it. During a pandemic (流行病), which the new coronavirus has the potential to become, "there is no immunity (免疫性) in the population so you have potential for a ___10___(globe) spread," warns Jones.