2013年初，杭州等地发现了H7N9禽流感传染病例，该病的病原体是一种新型禽流感病毒，它能从禽类传染给人。下列相关叙述正确的是

题干

2013年初，杭州等地发现了H7N9禽流感传染病例，该病的病原体是一种新型禽流感病毒，它能从禽类传染给人。下列相关叙述正确的是（）

A： H7N9禽流感病原体的细胞结构很简单，没有细胞核

B：侵入人体的H7N9禽流感病原体属于抗原

C： H7N9禽流感传染病是人体遗传物质发生变异而造成的疾病

D：与H7N9禽流感患者密切接触者均属于传染源，必须进行隔离观察

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B

This summer, Mary, Tom, Alan are going to have an ideal vacation .
The followings are their plans for the coming vacation .

	Mary	Tom	Alan
Where ?	The Great Wall	Spain	Canada
When?	The first week in June	The last day of the May	June, Monday 18^th
Who ?	His parents	His best friends	His cousin
What ?	Going hiking , Going sightseeing, Visiting some famous places in Beijing, Going shopping	Going sightseeing Going shopping Going camping Watching bull(牛)-fight	Spending time in the countryside , Renting videos at night , Going fishing , Going hiking, Sleeping a lot
How long?	About one month	Only two weeks	Until September
Transportation	By plane and by bus	By boat and by plane	By plane and by train