2．Why will the Venusian have to take their own oxygen with them when they carry out their flying saucer program because ______.

　　A．they need it in their way to the planet of Earth

　　B．the Earth's atmosphere is filled with deadly gases

　　C．there is a low level of oxygen for Venusians

　　D．there is no air on the planet of Earth

　　答案：B　细节理解题。由第六段“For another, the atmosphere is filled with carbon monoxide (一氧化碳) and other deadly gases and nobody could possibly breathe this air and survive.”可知，地球大气充满了有毒气体，所以金星人必须自带氧气。

　　3．It can be inferred from the passage that ______.

　　A．landing a manned flying saucer on Earth will be carried out soon

　　B．Venusians will land on Earth to help to stop serious pollution

　　C．it's unnecessary to land a manned flying

　　saucer on Earth at present

　　D．pollution on Earth makes it impossible for Venusians to survive there

　　答案：D　推理判断题。由文章后半部分可知，金星人登陆地球必须自带氧气和水。所以可以推测出地球的环境污染使金星人不可能在地球上生存。

　　4．Where can you probably read such a passage?

　　A．In a popular magazine.

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