下列关于二氧化硅的说法中，正确的是（ ） A．二氧化硅溶于水显酸性，所以二氧化硅

Being safe in your everyday life needs knowledge. If you remember the following information, your life will be much safer.

Don’t use earphones when running in the schoolyard or on the street. You will keep yourself from the outside world and can be easily surprised.

Schoolbags should be carried towards the front of your body instead of putting them on your back. When buses are crowded, it is easy enough for thieves to steal the things in your bag on your back.

If you are followed by a stranger, cross the street and go to the other way, let the stranger know that you know he or she is after you. Next, go and get help from others if it is necessary. Don’t go home directly. You are safer on the street than you are in your home or in a lift.

If you have to take a bus to a place far away, try to get to the stop a few minutes before the buses leave. This prevents a stranger from studying you. On buses, don’t sit alone, sit behind a driver or with friends. Don’t sleep.

Don’t play with matches(火柴）or candles, because it may cause fire. If your house catches fire and you have to escape through smoke, move on your hands and knees with your head 30 to 60 centimeters(厘米）above the floor. Please remember there is cleaner, cooler air near the floor during the fire.

根据短文内容判断正（T )误（F).

小题1:If you find a stranger following you, you should go home right away.

小题2:You’d better sit after the driver when you take a bus alone.

小题3:It’s good for you to use earphones when you are running outside.

小题4:You shouldn’t sleep all the way although it’s a long bus trip.

小题5:During the fire, the cleaner and the cooler air is far from the floor.

在我国，监护制度适用于( )。

A．无民事行为能力人

B．精神病人

C．限制民事行为能力人

D．未成年人和精神病人

防爆电气设备连接器内腔表面不得涂漆。（）

解决R&D/市场营销界面问题的方法和措施有哪些？

案情：白某(1990年8月9日出生)、刘某(1993年1月11日出生)预谋强 * * 邻居赵某(1993年5月16日出生)。2008年8月10日，白某和刘某将赵某从家中骗至黄魏公路北侧一水闸房内。白某先提出要与赵某发生性关系，遭到赵某拒绝，白某即使用暴力将赵某强 * * 。赵某被强 * * 后啼哭不止，白某惟恐赵某告发，到水闸房外与刘某密谋掐死赵某，以杀人灭口。刘某不同意，提出应待自己强 * * 完赵某再说。刘某将赵某强 * * 后，白某即上前狠掐赵某颈部，将赵某掐昏，刘某站在一旁没有插手。尔后，白某提出将赵某放到附近铁轨上，让列车将其轧死，制造赵某卧轨自杀的假象。随后，白某和刘某将赵某移至附近铁轨上，几分钟后，赵某被运行的列车撞击挤压，造成心脏破裂内出血死亡。白某和刘某作案后即逃离现场。刘某在2009年1月8日入室盗窃时被公安机关抓获，其供出白某，后公安机关亦将白某抓获归案。
被捕后，刘某除供述事实外，还供述在2008年5月至6月期间通过朋友关系结识了当地移动公司的工作人员穆某，穆某将职务过程中收集的部分客户个人信息卖给刘某，刘某转卖给某公司(其用于发送广告信息或联系客户)，从中赚得6000余元。白某交待自己曾于2007年2月至2008年2月参加麦森公司的“康贝乐”的保健品传销活动，发展“下线”达1000余人，从中获利80余万元。这公司采用“网上直销与代理”的方式，通过购买产品获得资格再继续发展他人参加，据调查白某已达到“高级”传销人员层级。
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