下列关于植物的说法正确的是（    ）

    In Chinese culture, people believe some numbers are lucky or unlucky. This is to see what Chinese character the number sounds like. For example, the Chinese word for the number 8 sounds like the word for “making a fortune”. So, people think it is a very lucky number. Some people spend a lot of money to have 8s in their phone numbers. The opening time of the Beijing Olympics began at 8:08 p.m. on August 8, 2008.

    The number 9 is also a lucky number. It is something to do with the emperors of China. There were nine dragons on emperors' robes(龙袍). Today, 9 often stands for “long lasting”. That's why close friends always use 99 or 999 to describe their friendship.

    So what's a “bad luck” number in China? It might be 4. Many Chinese people see 4 as a “bad luck” number. Because it sounds like the Chinese character for “death”.

    Because of this, many buildings don't have the fourth floor, and just call it the fifth floor. In Hong Kong, some buildings even don't have all floors numbered with 4, such as, 4、14、24、34 and all 40-49 floors. Some buildings also don't have the 13^th floor as 13 is an unlucky number in the West. Now a question for you: How many floors are actually there if a building's highest floor is numbered 50?

电磁波谱：电磁波按波长或频率大小的顺序排列成谱，就构成了电磁波谱．按波长从大到小的顺序是：无线电波、____、可见光、紫外线、____、γ射线．

二战后，东欧社会主义国家照搬苏联模式，由于不符合国情而日益陷入经济政治的危机．20世纪50年代中期起，东欧各国相继进行了改革，其中较为突出的是（    ）

已知流感病毒只含有一种核酸，现欲探究甲型H₁N₁流感病毒的核酸是DNA还是RNA．

材料用具：显微注射器，甲型H₁N₁流感病毒的核酸提取液，活鸡胚，DNA水解酶，RNA水解酶．

实验步骤：

（1）把甲型H₁N₁流感病毒核酸提取液分成相同的三组，分别用____ 处理其中两组核酸提取液．

（2）取等量的活鸡胚分成A、B、C三组，用显微注射技术向A组注射甲型H1N1流感病毒的核酸提取液，再分别向B、C两组活鸡胚中注射有关物质．

（3）分别从培养后的活鸡胚中抽取出样品，检测是否产生甲型H1N1流感病毒．

预测实验结果及分析：

①A组样品检测中含有甲型H₁N₁流感病毒．

②给B组活鸡胚注射的物质是____ ，若样品检测无甲型H₁N₁流感病毒产生，则____ 是遗传物质．

③给C组活鸡胚注射的物质是____ ，若样品检测无甲型H₁N₁流感病毒产生，则　____ 是遗传物质．