A
Coronaviruses(冠状病毒) are a large group of viruses. In this text, we’ll take a quick look at what’s recently known about the virus.
Covid-2019
The 2019 Novel Coronavirus, first reported December in Wuhan, central China’s Hubei Province, has quickly spread across the country and around the world.
Intermediate hosts (中间宿主) : The Covid-2019 may originate (起源) in bats, a team led by Chinese virologist Shi Zhengli said earlier, but the intermediate host remains unknown.
Incubation period(潜伏期): usually 1-14 days.
Infection: Virus may spread before symptoms show.
SARS-CoV
The SARS coronavirus was first identified in China in 2003.
Intermediate hosts: Bats are the original host.
Incubation period: 2-7 days.
Infection: Virus spread after symptoms show.
MERS-CoV
The MERS(中东呼吸综合征) coronavirus was first identified in Saudi Arabia in 2012.
Intermediate hosts: MERS-CoV was travelled from camel to humans.
Incubation period: 2-14 days.
Infection: Virus may spread before symptoms show.
1. What might be the intermediate hosts of the Covid-2019?
A. Bats. B. Mosquitoes C. Camel. D. Unknown yet.
2. Which kind of coronaviruses spreads after symptoms appear?
A. SARS-CoV. B. MERS-CoV. C. The Covid-2019. D. All Coronaviruses.
3. What can we learn about coronaviruses ?
A. Bats are to blame for the outbreak of all the three coronaviruses.
B. The Covid-2019, SARS-CoV and MERS-CoV are all listed as coronaviruses.
C. Mers-Cov were first identified in China.
D. SARS-Cov has a longer incubation period than Mers-cov.
【答案】1. D 2. A 3. B
【解析】
【分析】这是一篇说明文。文章介绍了包括新型冠状病毒在内的三种影响较大的冠状病毒。
【1题详解】
细节理解题。根据Covid-2019部分“Intermediate hosts: The Covid-2019 may originate in bats, a team led by Chinese virologist Shi Zhengli said earlier, but the intermediate host remains unknown.”（由中国病毒学家施正立领导的一个团队早些时候说，Covid-2019可能起源于蝙蝠，但中间宿主仍然未知。）可知，虽然研究表明可能是蝙蝠，但中间宿主究竟是什么还不清楚。故选D项。
【2题详解】
细节理解题。根据SARS-CoV部分“Infection: Virus spread after symptoms show.”（感染：症状出现后病毒传播。）可知，SARS病毒在携带者表现出症状后才会传播。故选A项。
【3题详解】
细节理解题。根据第一段最后一句“In this text, we’ll take a quick look at what’s recently known about the virus.”（在本文中，我们将快速浏览一下最近对该病毒的了解。）并结合通读全文可知，本文的内容就是介绍目前了解到的冠状病毒的情况，所以文中列举出的三种病毒都隶属于冠状病毒。故选B项。
【点睛】
