食品与卫生健康密切相关．下列做法不会危害人体健康的是（ ） A．为保持肉制品鲜美

Ⅰ．下列四支试管中，过氧化氢分解的化学反应速率最大的是______

试管	温度	过氧化氢浓度	催化剂
a	室温（25℃）	12%	有
b	水浴加热（50℃）	4%	无
c	水浴加热（50℃）	12%	有
d	室温（25℃）	4%	无

Ⅱ．某实验小组以H₂O₂分解为例，研究浓度、催化剂、溶液酸碱性对反应速率的影响．在常温下按照如下方案完成实验．

实验编号	反应物	催化剂
①	10mL2% H2O2溶液	无
②	10mL5% H2O2溶液	无
③	10mL5% H2O2溶液	1mL0.1mol•L-1FeCl3溶液
④	10mL5% H2O2溶液+少量HCl溶液	1mL0.1mol•L-1FeCl3溶液
⑤	10mL5% H2O2溶液+少量NaOH溶液	1mL0.1mol•L-1FeCl3溶液

（1）实验①和②的目的是______．

（2）写出实验③的化学反应方程式______．

（3）实验③、④、⑤中，测得生成氧气的体积随时间变化的关系如图．分析如图能够得出的实验结论是______．

公安工作的成败，公安队伍战斗力的强弱，取决于( )

A．公安队伍管理机制

B．人民警察素质的高低

C．公安机关领导班子建设

D．公安装备的科技含量

Downing the last drop of an expensive famous brand H₂O as well as remembering to throw the empty bottle in the recycling bin, makes you feel pretty good about yourself, right? It shouldn’t. Even when the bottles are recycled, there are all kinds of other consequences of swallowing bottled water, says Melissa Peffers, the air-quality program manager for Environmental Defense.

The containers are often filled in faraway lands, then shipped from abroad, and stored in refrigerators at your local store. Compare that with the influence on environment of turning on your tap, filling a glass, and drinking up!

Anyone who is choosing bottled water for health reasons is misguided, says Peffers, “Most bottled water is just tap water.” And what comes out of your tap is carefully monitored to follow the strict rules. Consider another fact that bottled water is surprisingly expensive, especially when compared with the alternative, which is almost free, and it is astonishing that America’s desire for bottled water seems impossible to satisfy, reaching nearly 30 billion bottles a year.

“My parents’ generation never had bottled water,” says Isabelle Silverman, an Environmental Defense legal adviser. She has made a commitment to going bottle free. “You don’t need to fetch it home from the store, and it’s cheaper,” she adds.

Bottled water’s role as a status symbol needs to change, Peffers points out. So when a waiter at an expensive restaurant offers  “And what’s your drink?” that’s no reason to forget your conviction(信念). “Don’t be afraid to say, ‘I’ll have tap.’ Say it loud enough that the other tables nearby can hear you,” Peffers says. “And then spend that money on a dessert.”

小题1:In the first paragraph, the underlined sentence “It shouldn’t.” suggest that people _______.

A．shouldn’t feel pleased with finishing the water in the bottle.

B．shouldn’t feel good about drinking an expensive brand H₂O.

C．shouldn’t be pleased with just recycling empty bottles.

D．shouldn’t be satisfied with drinking only bottled water.小题2:According to the author, tap water is _______.

A．as safe as bottled water

B．morel likely to be polluted

C．healthier than bottle water

D．less convenient than bottled water小题3:The underlined part “going bottle free” (in Para. 4) means “_______”.

A．making bottled water free

B．giving up bottled water

C．recycling use water bottles

D．providing free water containers小题4:Why does Peffers ask people to say “I’ll have tap.” Loudly?

A．To encourage them to set an example for others to follow.

B．To advise them to save the money for one more dessert.

C．To remind them to be aware of their social status.

D．To persuade them to speak confidently in public.

目前在视频安防监控系统中，常用的图像格式有（）。

A、CIF；

B、VGA；

C、4CIF；

D、D1；

走动式管理方法的优越性包括（）。

A.管理策略灵活

B.发挥员工个性

C.工作具体化

D.增强管理者和员工的联动效应