用化学符号或名称填空。（4分） (1)—2价的氧元素； (2)3个铁离子 (3)

阅读理解。

      Hello! My name's Mary Brown. I'm a girl. I like (喜欢) red. I have (有) a red backpack. What's this? It's my

red pencil case. Is that my ruler? Yes, it is. It is a red ruler. What's that? It is a watch. Is it my watch? No, it

isn't. It's Bob's watch. It's blue.

1. What's the girl's family name? [ ]

A. Green.

B. Brown.

C. Miller.

2. The girl's favorite (最喜欢的) color is ______. [ ]

A. red

B. blue

C. brown

3. What color is the watch? It's ______. [ ]

A. red

B. blue

C. brown

4. Is that Bob's ruler? [ ]

A. Yes, it is.

B. No, it is.

C. No, it isn't.

5. That is ______ watch. [ ]

A. my

B. Mary's

C. Bob's

商用房贷款的额度最高为所购商用房价值的（），商住两用房贷款的额度比例最高为（）。

A.40%.40%

B.40%，45%

C.50%.50%

D.50%，55%

《突发公共卫生事件应急条例》规定：突发事件应急工作应当遵循的原则是

A．完善并建立监测与预警手段
B．预防为主常备不懈
C．积极预防认真报告
D．及时调查认真处理
E．监测分析综合评价

水电站中压缩空气有哪些作用？