一般情况下，木结构民用建筑与砖混结构民用建筑之间的防火间距不应小于()米。A．6 B

秦始皇统一了六国的货币，使用的是[ ]

A．圆形方孔铜钱

B．刀币

C．铲币

D．蚁鼻钱

下列反应的离子方程式书写正确的是 [ ]

A．氯化铜溶液与铁粉反应：Cu²⁺+Fe=Fe²⁺+Cu

B．稀H₂SO₄与铁粉反应：2Fe+6H⁺=2Fe³⁺+3H₂↑

C．氢氧化钡溶液与稀H₂SO₄反应：Ba²⁺+SO₄^2-=BaSO₄↓

D．碳酸钙与盐酸反应：CO₃^2-+2H⁺=H₂O+CO₂↑

风心病二尖瓣关闭不全可导致（）

A.左室扩大

B.左房扩大

C.肺动脉高压

D.全心扩大

E.右室扩大

Speaker A: Can I open a checking account hereSpeaker B: ______

A．May I ask why you want to open a checking account

B．I'm very sorry, but it's not my business.

C．By all means. But you have to deposit enough money before you can write out your checks.

D．If I were you, I would open a current account.

Man. I am looking for an apartment with a monthly rent to around two hundred dollars in this neighborhood. Can you give me some advice on thatWoman: Well, it’s rather hard to find anything for less than three hundred dollars around here. Rents are lower in suburbs, but you need transportation if you choose to live there.Question: What do we learn from the conversation

A．The man will probably have to find a roommate.

B．The man is unlikely to live in the suburbs.

C．The man will probably have to buy a car.

D．The man is unlikely to find exactly what he desires.