3.What if we run out of space?

　　what if 意为“倘使……将会怎样？”

　　Ⅰ.根据课文中的重点句子进行同义转换

　　1.As an economist, I'm often seen as being against the environment.

　　As I am working as an economist, people always regard me as the one who　is against the environment.

　　2.If you have any questions or comments, you can use this time to voice them.

　　If you have any questions or comments, you can

　　raise / voice them by using the time left.

　　3.My suggestion is that we should try to cut back on production and reduce the amount of things we make and buy.

　　I suggest that we (should) try　to cut back on production and reduce the amount of things we make and buy.

　　4.The world's population has grown to more than six times what it was in 1800.

　　The world's population now is six times as much as what it was in 1800.

　　5.Asking around, I find many people willing to pay slightly higher prices for things that are environmentally friendly.

　　When asked ， many people are willing to pay slightly higher prices for things that are environmentally friendly.

　　Ⅱ.汉译英

　　1. 发言结束后，我们就开始自由提问。(open; speech)

　　When the speech is over, we will open the floor for questions.

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