Some of the students are afraid of the t

My father and I stayed at the South Lake Hotel for a week when we visit Beijing last month. It is in the downtown area, but it is easy to go to anywhere from the hotel by public transport. We lived in a comfortably double-room with a big bath. What I liked best were the free high-speed Internet connection in the room. I checked my email messages every day. I also shared for my friends many photos taking in Beijing. The food was wonderful with reasonable prices, and we enjoyed several local dish.

It is such great hotel that I would recommend it to any friend of me who is going to Beijing.

人在剧烈运动后，血浆的pH值会明显下降，其原因是( )。

A．血浆中乳酸增多

B．血浆中磷酸肌酸增多

C．血浆中碳酸增多

D．血浆中丙酮酸增多

下列化学反应中既不是化合反应也不是分解反应的是（　　）

A．氢气+氧化铜

加热

铜+水

B．氧气+氢气

高温

水

C．碳酸钙

高温

氧化钙+二氧化碳

D．铁+氧气

加热

四氧化三铁

下列指标中的( )是从宏观角度反映建设速度的指标。

A．未完工程占用率

B．生产能力建成率

C．建设项目投产率

D．建设周期

副高的活动与我国的雨带、旱涝有何关系？