乙型肝炎一般不通过哪项进行传播（）。 A.输血和血制品传播 B.母婴传播 C.密切接

青春期应该开放自己的心灵世界，多与父母、老师和同学沟通，可以对任何人说出自己的秘密，不要有担忧。[    ]

ITP首选的治疗是（）

A.脾切除

B.大剂量丙种球蛋白

C.糖皮质激素

D.输浓缩血小板悬液

E.长春新碱

分解因式

（1）7x²-21x

（2）3a²-3b²

（3）x²-x-6  （十字相乘法）                     

（4）a⁴-8a²b²+16b⁴．

句式转换.

1. We go shopping every Sunday. (改为一般过去时)

    ______________________________________________________________________

2. He often stays at home on weekends. (改为一般疑问句)

    ______________________________________________________________________

3. Sometimes he practices his guitar. (用now改写为现在进行时)

    ______________________________________________________________________

4. Tom saw an interesting talk show last night. (画线提问)

    ______________________________________________________________________

5. Her aunt cooked pizza last week. (画线提问)

    ______________________________________________________________________

6. They went for a walk in the park. (画线提问)

    ______________________________________________________________________

7. Tina went to the mountains.

    __________________________________________________ (否定句)

    __________________________________________________ (一般疑问句)

    Yes, ________ ________ .     No, ________ _________ .

8. I have some money for a taxi.

    _________________________________________________ (否定句)

    _________________________________________________ (一般疑问句)

   Yes, ________ ________ .      No, _________ _________ .

霍乱()
HAV()
脊髓灰质炎()
HEV()
轮状病毒()

A．粪便的排毒期自发病前10日至病后4周，少数可达4月

B．自发病前2周至发病后2～4周内的粪便具有传染性，而以发病前5天至发病后1周最强

C．发病前9天至发病后8天

D．病后可持续排毒4～8天，极少数可长达18～42天

E．病期中可连续排毒5～14天