纳络酮治疗酒精中毒是因为具有（）。 A.镇静 B.兴奋呼吸 C.催醒 D.升高血压

清蒸木瓜的目的是（），便于切制。

LAS VEGAS (AFP) — Children may not like it but a British technology firm has invented an electronic babysitter -- a wristwatch-like device that lets parents know where their children are at all times.

The GPS Child Locator, or num8, attaches securely to a child’s wrist and contains a Global Positioning System (GPS), said Matthew Salmon, a spokesman for the manufacturer, lok8u.

"It uses GPS and GSM (Global System for Mobiles) technology with an accuracy of 10 feet (three meters)," he said. "It tracks your child."

"It only starts working when the device is connected to the child’s wrist," Salmon said, and is "very difficult to get off."

"Even if the child managed to get it off it would send an emergency text message through to your mobile phone," he said. "It would give you a Google Maps image with their exact location, the street name and the zip code."

When a child is wearing the device, a parent sends the text message "wru" and the child’s current location is sent back to a mobile phone or computer.

Parents can also log on to the company website to discover their child’s present location.

"You can also set up a perimeter, an invisible fence, and if they wander out of this invisible fence which you put on the Internet it will warn you," Salmon said. "It will text you immediately."

Salmon said the device is waterproof and shockproof and lasts for three days with a full charge.

It will be available in both Britain and the United States this year and retails for 200 dollars with a 10 dollar a month subscription fee.

He said the company had received thousands of inquiries about the device since launching it this week. "Fifty percent are positive, 50 percent are negative, that it’s a bit Big Brotherish," he said. "But it’s really just about letting you have freedom of mind."

小题1:Only when       does the device begin to work.

A．it uses GPS and GSM technology

B．it is put within about 3 meters

C．it’s joined to parents’ computer

D．it is fastened to the child’s wrist小题2:If a child is wearing the “wristwatch”, parents can track them by      .

A．sending the text message “wru”

B．replying to the text message

C．getting a Google Maps picture

D．phoning the local police station小题3:What Can we conclude from the text?

A．It won’t be easily found if a child loses t11e device

B．The device won’t work while a child is swimming

C．Parents can easily track children due to the device

D．The new product needs to be fully charged daily小题4:The purpose of the text is to      .

A．explain how to use the new device

B．attract more buyers to the new product

C．discuss advantages of a new invention

D．introduce a new electronic equipment

质量为m的物体静止在粗糙的水平地面上。现用一水平拉力使物体从静止开始运动，其运动的v-t图象如图所示。下列关于物体运动过程，分析不正确的是 （   ）

A．0~t1内拉力逐惭减小

B．0~t1内拉力对物体做负功

C．在t1 ~t2时间内拉力的功率为零

D．在t1~t2时间内合外力做功

清明节不吃的是（）

A.青团子

B.馓子

C.粽子

D.粥

沈庆，男，22岁，初中没毕业，性格内向、懒散、缺乏上进心。沈庆幼年时，父母离异，他随父亲生活。之后，父亲再婚，继母带来一位女儿，父亲和继母都没有工作，一家四口靠低保度日，生活十分困难。沈庆在上小学时，学习还不错，升初中后，由于父亲和继母对他不管不问，学习成绩一落千丈。他还天天逛网吧，在网吧结交了一群“哥们”，由于没钱上网，他负责看管“哥们”的财物，以此从“哥们”那边蹭上网时间或者和“哥们”一起上网。自从结交了一群“哥们”后，他经常彻夜不归。初二第二个学期，他对学习失去了兴趣，结束了读书生涯，仅拿到初中肄业证书，连劳动手册也无法办理，他也不急着找工作。

[问题]

上述案例中，沈庆面临的问题主要有哪些