有人说：“青春，是与七个自己相遇。一个明媚，一个忧伤，一个华丽，一个冒险，一个倔强，一个柔软，最后那个正在成长。”下列关于青春的说法正确的有（    ）

小朋跟随爸爸在烈日当空的河边玩耍，他发现脚踩在沙子上很烫，而踩在河水里却是凉的，这是因为 的比热容较大；一杯水的比热容为4.2×10³J/（kg·℃ ），它表示的物理意义是；将杯中的水倒掉一半后它的比热容将。

碘-131(质子数与中子数之和)具有放射性，对人体有害，而碘-127对人体无害。碘-127和碘-131是同种元素的不同原子，核电荷数均为53。下列说法正确的是（  ）

灯L标有“6V3W”的字样，将它接在9V的电源上，要使它正常发光，还应串联一个阻值为Ω的电阻，此电路工作2min一共消耗J的电能．

句型转换。

The Lees___________ dinner when I rang them.

小彤家使用的是瓶装液化气，每瓶中装入的液化气质量为21kg．液化气的热值取5×10⁷J/kg．

14—16世纪，西欧思想领域发生了巨大变化，产生变化的根本原因是（    ）

华西村是我国先富起来的典型。他们富了以后无偿提供、资金、技术、管理，在黑龙江和宁夏再造两个华西村，帮助当地农民脱贫奔小康。对此理解正确的是（   ）
①华西村先富带后富，共奔富裕路，符合我国倡导的富民政策 
②华西村的做法表现出了“富而思源”的高尚境界 
③华西村“小富即安”，没有“富而思进”
④让一部分人和地区先富起来，且让他们更加富裕，就实现了我们的目标   

某反应前后分子变化的微观示意图如下、下列说法正确的是（   ）

阅读下列短文, 根据短文中的信息完成文后表格, 每空一词。

      WARNING(警告): Holding a cell phone against your ear or putting it in your pocket may be bad for your health. This sentence is a warning that you’d better not put it close to you when a new phone is bought. Apple company, for example, doesn't want iPhones to come closer to you than 1.5 centimeters; Research In Motion, BlackBerry's producer, recommends 2.5 centimeters.

      If cell phone use can cause health problems, the result will be very serious. Americans spend 2.26 trillion minutes chatting on cell phones every year, which brings $109 billion for the wireless businessmen.

      Devra Davis, an epidemiologist(皮肤病专家)who has worked for the University of Pittsburgh, has published a book about mobile phone radiation(辐射)"Disconnect." Davis studies how often brain cancer happens during different age groups. As a result of mobile phone radiation, she finds that a big increase(增长)in brain cancer in the 20-to-29 age group and a drop for the older people.

      Children are more easily hurt by radiation than grown-ups, Ms. Davis and other scientists point out. But no studies have yet been finished on cell phone radiation and children, she says.

      Henry Lai, a research professor, began lab radiation studies in 1980 and found that mice exposed to(暴露在) radiofrequency（电波频率）radiation had destroyed DNA in their brains.

      Ms. Davis recommends using wired earphones（有线耳机）or the phone's speaker. Children should send text messages rather than call, she said, and pregnant women should keep phones away from their bodies.

It's to your health to use cell phones
from different companies.	● Apple company  using cell phones at least 1.5 centimeters.
	● Motion, BlackBerry's producer  2.5 centimeters.
Theof research from different areas	● Devra Davis pointed out in the book "Disconnect" that people in the 20-to-29 age are more likely to have brain cancer than older people of mobile phone radiation. ● Ms. Davis and other scientists studied that Children are  to be hurt by radiation than adults.
	● Henry Lai found that exposed to(暴露在) radiofrequency（电波频率) radiation had destroyed DNA in their brains.
Ms Davis'son how to use the cell phone safely	●Children should send text messages of call.  Pregnant women should keep phones away from their bodies.

家庭制作甜酒有如下工序：

①将酒曲粉末与糯米饭拌匀；②将糯米饭放入容器中盖好，用毛巾包裹起来置人温暖的地方；③用凉开水将糯米饭冲淋一次，冷却到30℃；④将糯米用水淘洗干净后浸泡一昼夜；⑤将糯米倒入蒸锅煮熟。(以上容器、毛巾等均要求消毒)

请对照制作工序，回答下列问题。

小凯家电能表上月底的示数为3537.3，本月底的示数如图所示，则小凯家本月消耗的电能为 度。这块电能表允许接入的用电器总功率为W。如果表盘转过60 圈，表明用电器消耗的电能为 kW ·h。

取6.8g含杂质的锌粒于烧杯中，向其中加入稀硫酸至恰好完全反应，共用去稀硫酸100g，实验结束后，称得烧杯中物质的总质量为106.6g。（杂质不溶于水也不与稀硫酸反应）请计算：

某兴趣小组欲探究Fe、Cu、Ag、R四种金属的活动性顺序（R为未知金属），进行了如下实验：

请利用化学知识回答问题。

下列有关物质的用途说法正确的是（   ）

“理智的人使自己适应这个世界，不理智的人却硬要世界适应自己。”走进中学，我 们的生活发生了很大的变化，一切改变都是一种新的开始，我们只有一个目标，那就是

二次函数 的图像如图所示，下列不符合题意的是（  ）

二战后，非洲民族独立运动如火如荼，各国为争取经济和政治独立进行着不懈的斗争下列史实标志着非洲国家最终实现政治独立的是（    ）