关于亚洲自然地理特征的叙述，正确的是（ ） A．以山地、高原为主，平均海拔居各大

质量为m的带正电小球由空中A点无初速自由下落，在t秒末加上竖直向上、范围足够大的匀强电场，再经过t秒小球又回到A点。不计空气阻力且小球从未落地，则 [ ]

A．整个过程中小球电势能变化了

B．整个过程中小球动量增量的大小为2mgt

C．从加电场开始到小球运动到最低点时小球动能变化了mg²t²

D．从A点到最低点小球重力势能变化了

小儿结核性脑膜炎早期临床表现是

A．前囟饱满

B．性格改变

C．惊厥

D．意识模糊

E．脑膜刺激征

为节约用水，某市规定三口之家每月标准用水量为15立方米，超过部分加价收费，假设不超过部分水费为1.5元/立方米，超过部分水费为3元/立方米．

（1）设小明家这个月的用水量为x吨，当x≤15时，应付水费为______ 元，当x≥15时，应付水费为______ 元．

（2）如果小明家某月缴纳水费37.5元，那么该月小明家用水多少立方米？

It seems that Great Wall is the place to rock. There will be two parties held on the Great Wall this month.

Great Wall Ⅰ

The latest Great Wall party is sponsored(主办)by the Club and electrobeat and held at Jinshanling. Local DJ Mark ,as well as guest Slab from Australia ,Usami and Bobby from Hong Kong will spin the sounds. All drinks are priced at 20 yuan(＄2.4).

Tickets:200 yuan(＄24), including bus ride there and back plus entrance fee to the Great Wall.

T/D: 8 p.m. to 2 a. m., Sept.20.

Pre-sale tickets are available at: Public Space: 6416-0759 Neo Lounge: 6416-1077

Location: Buses leave at 5 p.m. on Saturday ,Sep. 20 from Neo Lounge, 99 Xinfuncun Zhonglu, Sanlitun, Chaoyan District.

For more info: www. elektrobeat.com

Great Wall Ⅱ

The other party at the end of this month at Jinshanling will be kick-started with live performances by Askar, Brain Failure, Longkuan, Supermarket, Mr.Zhou, Beijing Talking and the Yi band.

Dance till dawn to the groovy(绝妙的)sounds of DJs Ben ,Mickey Zhang ,Will, Cheese, Gao Hu and Huang Weiwei.

T/D: 8 p.m. to 2 a.m. ,Sept. 27.

Tickets: 350 yuan(＄42)or 300 yuan(＄36) for groups of 10 or more, 500 yuan (＄60) at the door and VIP tickets 800 yuan(＄72), transportation included..

Location: Buses depart from the north gate of Workers, Stadium at noon, 2 p.m., 4 p.m., Sept. 27.

For more info: contact Li Zhenhua at lzh@msgp.org or call 133-2119-1731.

小题1: Which is true according to the text?

A．You have to pay extra money for entering the Great Wall with a ticket.

B．You have to use a computer to get the details about Great Wall Rock.

C．You have to pay extra money for bus ride with a ticket.

D．It is at least 4 hours, ride from Neo Lounge to Jinshanling.小题2: What day of the week is September 27?

A．Saturday .

B．Sunday.

C．Weekday.

D．It can’t be known.小题3: A dozen people want to attend Great Wall Ⅱ.They should pay at least _________ for the tickets.

A．＄504

B．＄432

C．＄720

D．＄864小题4:If you want to go Great Wall Rock , _______________________.

A．you’ll have to get up early to catch the bus

B．you’ll have to spend a whole day on the bus

C．you can take a bus at any time from 8 p.m. to 2 a.m.

D．you can’t take a morning bus to get there

青壮年男性，腹股沟内侧肿块，下降至阴囊，平卧后消失。可能是（）。

A．腹股沟斜疝 

B．腹股沟直疝 

C．股疝 

D．睾丸鞘膜积液 

E．隐睾