【正确答案】 D

【答案解析】[听力原文]
Thank you. It"s great to see so many of you interested in this series on "Survival in the Outer Space". Tonight I"m going to talk about one of the most basic aspects of survival: the space suit. When most of you imagine astronaut, that"s probably the first thing that comes to mind, right? Well, without space suit it will not be possible for us to survive in space. For example, outer space is a vacuum. There"s no gravity or air pressure. Without protection, a body would explode. What"s more, we cook in the sun or freeze in the shade with temperatures ranging from a toasty 300 degrees above to a cool 300 degrees below zero Fahrenheit. The space suit that NASA has developed is truly a marvel. This photo enlargement here is a life size image of an actual space suit worn by astronauts on the last space shuttle mission. This part is the torso. It is made of seven extremely durable layers. This thick insulation protects against temperature extremes and radiation. Next is what they call a bladder of oxygen. That"s an inflatable sack filled with oxygen to simulate atmosphere pressure. This bladder presses against the body with the same force as the earth atmosphere at sea level. The innermost layers provide liquid cooling and ventilation. Despite all the layers the suit is flexible, allowing free movement, so we can work. Another really sophisticated part of the space suit is the helmet. I brought one along to show you.

What"s the speaker"s main purpose?

[解析] 四项均为不定式短语，均提及space。由于该题处于第一题，且选项核心动词分别为show、gain、describe、inform，因此本题很有可能是问讲话者的目的，即短文的主旨。
短文开头处提到：“欢迎收看《外太空生存》系列节目，今晚我们来谈一谈涉及太空生存的最基本因素中的其中一个：宇航服。”随后讲话者简要介绍了宇航服的功能以及其各个部分。故选D。

【正确答案】 A

【答案解析】[听力原文]
What would cause an unprotected human body to explode in the outer space?

[解析] 四项均为名词短语，其中三项与太空中的独特条件(air pressure，temperature，radiation)有关，可能考查宇航服的某种设计原理。
短文中提到，宇航服是太空生活所必需的，因为外太空是一个真空空间，没有任何重力和气压，如果没有防护的话，人体将会爆炸。故选A。

【正确答案】 C

【答案解析】[听力原文]
What does the speaker show the audience as she describes the different parts of space suit?

[解析] 四项均为名词或名词短语，分别为一盘录像带、一本书、一幅照片、一个氧气罐。应注意短文中是否提到相应的细节。
短文后面部分提到：“这张放大版的照片是一个实物大小的宇航服照片，上一次执行太空任务的宇航员所穿的就是这套宇航服。”接着，讲话者介绍了宇航服各个组成部分。picture是对原文中photo enlargement的同义转述，故选C。