She _____ her mother in appearance but they are different from each other in character.

将钠、铝、铁各1mol分别投入到等体积且同浓度的盐酸中，产生的氢气体积在相同条件下（   ）

Neither Wang Peng's restaurant nor Yong Hui's offers  a     b  diet and they should combine their menus.

书面表达

假如你是李华，你校学生会将为来访的美国学生们举办一个晚会，要在学校广播中宣布此事，并欢迎大家参加。为使美国学生听懂，请你用英语写一篇广播通知。

要点如下:

目的: 欢迎来访的美国学生

组织者:学生会

时间:2月18日(星期六)晚7:30

地点: 一楼报告厅

活动内容:音乐,跳舞.唱歌,游戏,交换小礼品

注意：1）. 词数： 不少于100词 ；

2）. 可根据内容要点适当增加细节，以使行文连贯；

将一定量的铜粉加入到100mL某浓度的稀硝酸中，充分反应后，容器中剩有m₁g铜粉，此时共收集到NO气体a mL（标准状况）．然后向上述混合物中加入足量稀硫酸至不再反应为止，容器中仍剩有铜粉m₂g，则（m₁﹣m₂）为（   ）

镆(Mc)是一种人工合成的放射性金属元素。关于 Mc、 Mc的描述正确的是（   ）

With time (go) by, he comes to realize the importance of time.

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。

    Snow falls in the Earth's extreme North and South throughout the year. However, the heaviest snowfalls have been reported in the mountains of other areas during winter. Snow is even known to fall near the Equator (赤道), but only on the highest mountains.

    Snow contains much less water than rain, but much of the water the world uses comes from snow. In the western United States, mountain snow provides up to seventy-five percent of all surface water supplies.

    Snowfall helps to protect plants and some wild animals from winter weather. Fresh snow is made largely of air trapped among the snow crystals (晶体). Because the air has trouble moving, the movement of heat is limited. The surface of the snow takes in, or absorbs, sound waves. As snow grows older or if there have been strong winds, it can become hard and flat. Then, the snow's surface will help to send back sound waves.

    It is responsible for the deaths of hundreds of people. Many people die in traffic accidents on roads covered with snow and ice or from being seriously stuck in the winter storm. .

    People may not be able to avoid living in areas where it snows often. However, they can avoid becoming victims of snowstorms. People should stop driving and stay at home until the storm has passed. People living in these areas should carry emergency supplies in their vehicle.

A. These include food, emergency medical supplies, and extra clothing to stay warm and dry.

B. Snow also influences the movement of sound waves.

C. Melting snow provides water for rivers, electric power stations and agricultural crops.

D. Mountain snowfall is heavier than that in the South and the North Poles.

E. In many places, streets were blocked; houses fell down and supplies were short.

F. Others die from heart attacks caused by too much physical activity out in the cold.

G. Snow may be beautiful, but it can be deadly.

—Tell me something about your adventure in the rainforest, please.

— We lost our way in the forest and ___ made matters worse was ___ night began to fall.

某元素的最高价氧化物分子式R₂O₅ ， 已知R的气态氢化物中含氢8.82%，则R的相对原子量约为．

正如你们都知道的，他在绘画界很有名。（as引导的定语从句）

, he is famous in the field of painting.

—Put these glasses away before they get (break).

—OK.I will put them in the cupboard.

He became internationally famous his novels and poetry.

____is known to all, good friends _________ happiness and value to life.

某烃1mol 最多能和2molHBr 加成反应，其所得的产物又能跟8molBr₂ 发生取代反应，最后得到一种只含碳、溴两种元素的化合物，则原烃为（   ）

With his key ________，he couldn't enter his home，so he had to wait for his wife to come home.

某文献记载的数据有：

回答下列各数得含义：

下列原子结构示意图正确的是（   ）

稀有金属铟由于其良好的性能常用于生产液晶显示器和平板屏幕，下图是铟元素的相关信息，下列有关铟的说法错误的是（   ）

向一定量的Fe、FeO和Fe₂O₃的混合物中加入100ml  2mol/L的盐酸，恰好使混合物完全溶解，放出44.8ml标准状况下的气体，所得溶液中，加入溶液无红色出现，那么若用一氧化碳在高温下还原相同质量的此混合物，能得到铁的质量（   ）