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下列说法不正确的是（　　）

在奥运会100米短跑比赛中，用时越多成绩越好。

核电站所用的核燃料属于（选填“可再生”或“不可再生”）能源．在反应堆中，核燃料发生（选填“裂变”或“聚变”）释放出大量的内能．核电站发电的过程经历了将核能转化为能，再将该形式的能通过蒸汽轮机转化为能，最终转化为人们所需要的电能．

水刀切割具有精度高、无热变形、无毛刺、无需二次加工以及节约材料等特点，得到广泛应用．某水刀切割机床如图所示，若横截面直径为d的水流以速度v垂直射到要切割的钢板上，碰到钢板后水的速度减为零，已知水的密度为ρ，则钢板受到水的冲力大小为（   ）

如图所示为把鲫鱼、蝙蝠、朱鹮、蝗虫、娃娃鱼、扬子鳄六种动物根据一对或几对相对性状的区别，建立二歧分类检索表：

若将上述检索表转换成文字形式的检索表可表示如下，请完成其中空格。

脊椎动物检索 1a皮肤有皮毛……………………………………………………………………………A 1b皮肤无皮毛……………………………………………………………………………2 2a 有羽毛……………………………………………………………………………… B 2b无羽毛…………………………………………………………………………………3 3a…………………………………………………………… 3b……………………………………………………………… 4 a  无鳍………………………………………………………………………………D 4b  有鳍………………………………………………………………………………E

下列词语书写完全正确的一项是（    ）

小宁在乘坐家里新买的小轿车，当他坐在副驾驶位置上时，发现不系安全带时老是有“叮叮”的报警声。   通过研究，他发现：当安全带系好时，相当于闭合开关，报警器不响；安全带未系好时，相当于断开开关， 报警器报警。下图中符合上述要求的电路图是（   ）

英汉互译。

当你与别人交流时保持的距离称之为“人际距高”。研究发现,气候较冷地区的人们往往更喜欢靠近朋友。下列国家中,人际距离最小的可能是（ ）

选出不同类的单词（   ）

听录音，选出单词（   ）

下图为世界局部区域洋流分布示意图。完成下面小题。

 

某岩层中含有恐龙化石，那么此岩层的岩石可能是（   ）

下列物质的用途不正确的是（   ）

At the beginning of a speech, it is very important to grab the audience's attention and make them interested in ______ you have to say.

1993年欧盟成立时，有12个成员国，后来经过几次扩大，2007年成员国已达27个。这说明（    ）

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

One of my earliest memories was watching my mom talk on our old phone. I was fascinated that she could talk to someone who wasn't actually in the room with her.  I wondering how she managed to talk with someone she couldn't see.

 Later, we had mobile phones that could be carried around the room. Then came computers and smart phones. These days I can send an e-mail around the world in a second. My daughter's smart phone has a hundred apps and a dozen social media accounts. She stores all of her information in a mysterious place known as "the cloud", where she can take it out at any time. It seems that we are more connected in this world than ever before.

 Few take the time to talk face to face. Instead of looking into the eyes of our loved ones, we stare at our screens. It seems as if the most connected generations are also the loneliest.

Don't let technology take our time and ruin our life. Make the time to meet, to pray and to communicate with each other. Take a walk on the beach with a friend. Have a long conversation with the phones off and the hearts on.

Remember that we are here to love each other, help each other and make this world a better place.  But when it can't, turn it off.

A. That was a long time ago.

B. Connect offline as well as online.

C. Smart phones have both advantages and disadvantages.

D. We should communicate with each other with phones off.

E. When your technology can help to do these things, then use it.

F. However, what bothers me is that we rarely associate with each other nowadays.

G. When she left the room, I slowly walked over to the phone and stared at it for a while.

铝与足量稀硫酸反应产生硫酸铝和氢气，当反应产生2g氢气时消耗铝的质量为（   ）

中国近代交通工具不断进步。下列不属于交通领域变化趋势的是(    )