Coronaviruses(冠状病毒) are a large group of viruses. They consist of a core of genetic material(遗传物质) surrounded by an envelope with protein spikes(蛋白棘突). This gives it the appearance of a crown. Crown in Latin is called “corona” and that’s how these viruses get their name. In this text, we’ll take a quick look at what’s currently 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. It initially occurred in a group of people with pneumonia(肺炎) who’d been associated with a seafood and live animal market in the city of Wuhan.
Intermediate hosts: The Covid-2019 may originate in bats, a team led by renowned Chinese virologist Shi Zhengli said earlier, while the intermediary host remains unknown.
Incubation period(潜伏期): usually 1-14 days.
Infection: Virus may spread before symptoms show.
SARS-CoV
The Severe Acute Respiratory Syndrome (SARS) coronavirus was first identified in China in 2003 .
Intermediate hosts: Bats are the original host. Civet cats serve as an important intermediary that carries virus from the winged mammal to humans.
Incubation period: 2-7 days.
Infection: Virus spread after symptoms show.
MERS-CoV
The Middle East Respiratory Syndrome (MERS中东呼吸综合征) coronavirus was first identified in Saudi Arabia in 2012.
Intermediate hosts: MERS-CoV was travelled from dromedary 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.
听下面一段独白，回答以下小题。
1.Who can join the Road Safety Team?
A.Students in Junior 1 and 2.
B.Students in Senior 2 and 3.
C.Students in Senior 1 and 2.
2.What can students get from Miss Mailer?
A.A book. B.A letter. C.A picture.
3.What activity is the team also organizing?
A.A short quiz.
B.A writing competition.
C.A poster design competition.
听下面一段较长对话，回答以下小题。
1.What probably is the man?
A.A doctor.
B.A lawyer.
C.An architect.
2.How will the man get to the bus station tomorrow morning?
A.He will walk there.
B.He will go there in his car.
C.His wife will take him there.
3.When will the man take the return bus tomorrow?
A.At 6:30 p.m.
B.At 8:00 p.m.
C.At 9:30 p.m.
听下面一段较长对话，回答以下小题。
1.What does the woman say about the sports centre?
A.It was small.
B.It was noisy.
C.It was expensive.
2.Why didn’t the woman stay in the café?
A.It was not clean.
B.The service was bad.
C.She had an appointment.
3.What does the man suggest doing right now?
A.Playing tennis.
B.Going to a club.
C.Swimming in the river.
听下面一段较长对话，回答以下小题。
1.What are the speakers mainly talking about?
A.The first day at a new job.
B.A usual day at work.
C.A new boss.
2.What does the woman think of her boss?
A.Indifferent.
B.Supportive.
C.Inexperienced.
3.What do we know about the woman?
A.She has a good overtime pay.
B.She often works late at night.
C.She had a hard time at work today.
听下面一段较长对话，回答以下小题。
1.What is wrong with the man?
A.He feels tired and sad.
B.He eats less every day.
C.He keeps awake at night.
2.What do we know about the man?
A.He is a student.
B.He is a foreigner.
C.He is seriously ill.
3.Why does the woman know so much about cultural shock?
A.She is an expert.
B.She has heard about it.
C.She has the similar experience.
