分析有关科学探究的资料，回答问题．

•某高山植物开红花，偶然发现了一株开白花的．

I．请设计实验来探究这株植物的白花性状是受环境影响还是基因突变的结果．

（1）实验步骤：第一步：取该株植物的茎尖，利用____技术，获得试管苗．第二步：____，观察并记录结果．

（2）预测结果及结论：若仍开白花，则____ ．

II．对该种植物进行了培养并记录如下表．

（3）本实验中共涉及哪些自变量（指研究者主动操纵的因素或条件）？____ ．实验结果说明了什么问题？____ 

（4）在相同海拔，25℃突变率大于19℃突变率．从植物体本身来说，最可能是与其体内的____ （物质）有关．

（5）为了探究在海拔为3 000m、25℃时该植物的突变率是否最高，你认为应如何进行实验？（简要步骤）

____ 

____ 

____ 　

选出与你所听到的词语（  ）

    Some British and American people like to invite friends for a meal at home. You should not be upset(不安的)if your English friends don't invite you home. It doesn't mean they don't like you. Dinner parties usually start between 7 and 8 p. m. and end at about 11. Ask your hosts what time you should arrive. It's polite to bring flowers, chocolates or a bottle of wine as a gift. Usually the evening starts with drinks and snacks. If you want to be very polite, say how much you like the room, or the pictures on the wall. But remember－it's not polite to ask how much things cost. In many families, the husband sits at one of the table and the wife sits at the other end. They eat with their guests. You'll probably start the meal with soup or something small, then you'll have meat or fish with vegetables, and then dessert followed by coffee. It's polite to finish everything on your plate and to take more if you want it. Did you enjoy the evening? Call your hosts the next day, or write them a short "thank you" letter. British and American people like to say "thank you, thank you, thank you" all the time!

阅读下面古诗，完成下列各题

己亥杂诗

龚自珍

浩荡离愁白日斜，吟鞭东指即天涯。落红不是无情物，化作春泥更护花。