宪法和法律规定公民必须履行的义务是指[ ] A．公民的法定义务 B．公民的道德义

当x=3时，对于二元一次方程3x+2y=8，y=______．

患者25岁，男，左足趾间瘙痒伴小丘疹、水疱2个月，未予治疗，昨日突发患足背、小腿红肿、疼痛。体检：T38．5℃，左足趾间针头大小丘疹，水疱伴轻度糜烂。右足正常。左足背至胫前大片红斑，轻度肿胀，紧张发亮，可见张力性小水疱，皮温高，左腹股沟可扪及肿大淋巴结。WBC12．5×10⁹/L，N80%。

请你根据上述病例资料做出可能的诊断（）。

A.湿疹

B.足癣

C.丹毒

D.接触性皮炎

E.蜂窝织炎

F.单纯疱疹

在黑暗的环境中摄影，通常都要使用闪光灯．

（a）闪光灯所产生的是会聚光束、平行光束、还是发散光束？产生这种光束的好处是甚么？

（b）一个夜里，你的朋友站在漆黑的大球场中央，要你替他拍照．解释为甚么即使使用了闪光灯，照片上的背景还是非常昏暗．

Whether you’re headed to another country for business or pleasure, it is likely that you need to keep in touch with family or business partners in the United States. But if you plan to do that using your cellphone, you could have an unwelcome surprise—U.S. cellphones don’t work abroad. U.S. companies use different forms of technology, not like most of the international community, including Europe.

However, there is an easy, cost-effective solution to staying in touch while you’re traveling. You can rent a phone that is guaranteed（保证）to work in the countries you’re visiting. Roadpost offers a 30-day cellphone rental plan that includes free incoming calls, free voicemail and call waiting services.

The service is convenient and simple. You can place your order online and your phone will be shipped to arrive on the date you want. If an unexpected business trip comes up, Roadpost can provide next-day delivery for most cities. In addition to the phone, Roadpost provides a spare battery, travel charger and a leather carrying case.

When your phone is shipped from Roadpost, you receive an e-mail confirmation（确认）that contains your international cellphone number so you can leave it with family members and business partners; Roadpost even provides business cards preprinted with your international phone number.

Those who don’t want to be without e-mail while traveling can rent an international BlackBerry. It can be hard to stay in touch by e-mail when traveling. With an international BlackBerry, you can e-mail as much as you like, without worrying about an expensive bill. If you’re traveling to very remote areas, you may want to consider renting a satellite phone, because it receives its signals from satellites, this phone works anywhere on the planet, including oceans and mountains. When you return, simply ship the phone or BlackBerry back to Roadpost using the return kit the company provides.

小题1:The first paragraph mainly tells us that_________.

A．Americans need to change their cellphones

B．European form of technology is different from America’s

C．U.S. cellphones don’t work abroad

D．Americans who go abroad will meet an unwelcome surprise小题2:According to the text,it can be inferred that__________.

A．an international BlackBerry is only used to send e-mail

B．Roadpost can offer cellphones using in different areas

C．you should select a bag used to send your cellphone

D．Roadpost sells the best cellphones小题3:Which of the free services can you get from Roadpost?

A．Voicemail.

B．Sending e-mail.

C．Shipping the phone back.

D．Call waiting services.小题4:Which of the following will help you a lot in mountainous areas?

A．BlackBerry.

B．The return kit.

C．E-mail.

D．Satellite phones.

下后后场击高球是应在手臂伸直的（）击球

A、稍前方

B、稍后方

C、最高点

D、任意舒适的位置