2010年中秋节，我们吃掉6000多棵树，它们变成了月饼的包装盒，被扔在垃圾箱里。越来越漂亮的包装，年年都吃不完的月饼，正拷问着商业时代人们的良知。对此你认为理解正确的有（   ）

①包装是身份的象征，中秋月饼的华丽包装并不过分

②消费者应理性消费，做到物有所值

③表明随着我国综合国力的提高，人们生活水平也在提高，所以无可厚非

④追求健康文明的生活方式，注意保护环境

在做测小灯泡的电阻的实验中，我们发现小灯泡两端的电压减小时，小灯泡的电阻也可能随之减小，这是因为（　　）

We spent two hours analyzing the team's ____（强项）and weaknesses.

根据短文内容，判断下列各句正误。
      Hong Kong has about forty public beaches. Some of them are very famous around the world. People can go there for a swim. You can go to them by bus. To go to some beaches you must take a boat.
    You will swim there without danger if you remember these instructions:
    Never swim alone.
    Never go out in a boat if you cannot swim.
    Never swim after a meal or when you feel hungry or tired.
    Don't stay in the water too long.
    Remember: A red flag means that it is dangerous for anybody to go into the water. A blue flag means that it is dangerous for children.