下列关于甲型肝炎的叙述，正确的是（） A.急性甲型肝炎的患者是传染源 B.血液中HA

6， 18， ( )， 78， 126

A．40
B．41
C．42
D．44

已知集合A={x|3≤x＜7}，B={x|2＜x＜10}，求C_R(A∪B)，(C_RA)∩B，C_R(A∩B)。

改写句子 按括号中的要求完成改写后的句子，每个空格填一个单词。（5分）

小题1:I like salad for breakfast.(改为否定句)

I ___________ ___________ salad for breakfast.

小题2:The post office is across from the supermarket. (就划线部分提问)

_____________ _____________the post office?

小题3:The tourist asked me, “ How do you feel about Jinan Olympic Sports Center?” (改写句子，句意不变）

The tourist asked me how ___________ ___________ about Jinan Olympic Sports Center.

小题4:The girl has become a popular singer and many of her fans want to be like her. (改写句子，句意不变）

The girl has become a popular singer and she is ___________ ___________ to many of her fans.

小题5:People gave some food to the village girl when they saw her on the street last month. (改写句子，句意不变）

Some food ___________ given to the village girl when she was___________ on the street last month.

若一个原子的最高主量子数为3，则它处于基态时，下列哪条叙述是正确的？（）

A.只有s电子和p电子

B.只有p电子和d电子

C.有s、p和d电子

D.有s、p、d和f电子