一、根据句意，用括号中所给单词的适当形式填空
1. Each child needs to take (dry) food and water for the trip.
2. A tent and a (sleep) bag are necessary when you have to camp outside.
3. (travel) to Mars is a dream for many space lovers.
4. We need to wear special boots to make us heavier because there is (little) gravity on Mars than on the Earth.
5. Life on Mars would be very interesting and there would be no (pollute) there.
1. Each child needs to take (dry) food and water for the trip.
2. A tent and a (sleep) bag are necessary when you have to camp outside.
3. (travel) to Mars is a dream for many space lovers.
4. We need to wear special boots to make us heavier because there is (little) gravity on Mars than on the Earth.
5. Life on Mars would be very interesting and there would be no (pollute) there.
答案：1. dried
2. sleeping
3. Travelling/Traveling
4. less
5. pollution
2. sleeping
3. Travelling/Traveling
4. less
5. pollution
解析：
1. 此处需用形容词修饰名词food，dried food是固定搭配，意为“干粮”，符合旅行携带物品的语境，故填dried。
2. sleeping bag为固定短语，意为“睡袋”，用sleep的动名词形式作定语修饰bag，故填sleeping。
3. 此处需要动名词作句子主语，表达“去火星旅行”这一行为，故填Travelling（或Traveling）。
4. 根据句中的than可知此处要用little的比较级形式，less表示“更少的”，符合火星引力比地球小的语境，故填less。
5. no后接名词，pollute的名词形式是pollution，意为“污染”，符合句意，故填pollution。
2. sleeping bag为固定短语，意为“睡袋”，用sleep的动名词形式作定语修饰bag，故填sleeping。
3. 此处需要动名词作句子主语，表达“去火星旅行”这一行为，故填Travelling（或Traveling）。
4. 根据句中的than可知此处要用little的比较级形式，less表示“更少的”，符合火星引力比地球小的语境，故填less。
5. no后接名词，pollute的名词形式是pollution，意为“污染”，符合句意，故填pollution。
二、从方框中选择适当的单词和词组填空
air tank power pack space helmet computer
sleeping bags dried food special boots tents
Andy: Have you ever thought of living on Mars, Kitty?
Kitty: Yes, but I wonder what it would be like to live on Mars.
Andy: It's much colder at night on Mars than on the Earth. We might need special
⁽¹⁾ and ⁽²⁾ before we could build houses on Mars.
Kitty: I hear the low gravity on Mars might be a problem, right?
Andy: Yes. We'd probably need to wear ⁽³⁾ so that we could walk on Mars.
Kitty: What would we eat on Mars?
Andy: Scientists are not sure whether plants could grow there. Maybe we would have to eat
⁽⁴⁾ .
Kitty: Oh, that's terrible! Would we be dressed like an astronaut?
Andy: Sure. We might need to wear a(n) ⁽⁵⁾ and carry a(n) ⁽⁶⁾
on our back. They allow us to breathe on Mars.
Kitty: Sounds cool! Could we keep in touch with our family members and friends on the Earth?
Andy: I think a special ⁽⁷⁾ could connect us with people back on the Earth.
Kitty: We might also need a(n) ⁽⁸⁾ to provide enough energy.
Andy: I agree.
air tank power pack space helmet computer
sleeping bags dried food special boots tents
Andy: Have you ever thought of living on Mars, Kitty?
Kitty: Yes, but I wonder what it would be like to live on Mars.
Andy: It's much colder at night on Mars than on the Earth. We might need special
⁽¹⁾ and ⁽²⁾ before we could build houses on Mars.
Kitty: I hear the low gravity on Mars might be a problem, right?
Andy: Yes. We'd probably need to wear ⁽³⁾ so that we could walk on Mars.
Kitty: What would we eat on Mars?
Andy: Scientists are not sure whether plants could grow there. Maybe we would have to eat
⁽⁴⁾ .
Kitty: Oh, that's terrible! Would we be dressed like an astronaut?
Andy: Sure. We might need to wear a(n) ⁽⁵⁾ and carry a(n) ⁽⁶⁾
on our back. They allow us to breathe on Mars.
Kitty: Sounds cool! Could we keep in touch with our family members and friends on the Earth?
Andy: I think a special ⁽⁷⁾ could connect us with people back on the Earth.
Kitty: We might also need a(n) ⁽⁸⁾ to provide enough energy.
Andy: I agree.
答案：(1) sleeping bags (2) tents (3) special boots (4) dried food (5) space helmet (6) air tank (7) computer (8) power pack
解析：
1. 根据前文“It's much colder at night on Mars than on the Earth.”以及“before we could build houses”，sleeping bags（睡袋）是夜间保暖的必备物品，符合语境。
2. 结合上一空的语境，tents（帐篷）是建造房屋前的临时居住设施，符合要求。
3. 根据前文“low gravity on Mars might be a problem”和“walk on Mars”，special boots（特制靴子）能帮助人们在低重力环境下正常行走，符合语境。
4. 根据前文“Scientists are not sure whether plants could grow there.”，在无法种植新鲜食物的情况下，dried food（脱水食物）是合适的选择。
5. 根据前文“be dressed like an astronaut”和“breathe on Mars”，space helmet（太空头盔）是宇航员呼吸防护的必备装备，符合语境。
6. 根据“carry...on our back”和“They allow us to breathe on Mars.”，air tank（氧气罐）是背在背上提供呼吸所需氧气的设备，符合要求。
7. 根据“keep in touch with our family members and friends on the Earth”，computer（电脑）可实现星际通讯，符合语境。
8. 根据“provide enough energy”，power pack（电源组）是能提供能量的设备，符合要求。
2. 结合上一空的语境，tents（帐篷）是建造房屋前的临时居住设施，符合要求。
3. 根据前文“low gravity on Mars might be a problem”和“walk on Mars”，special boots（特制靴子）能帮助人们在低重力环境下正常行走，符合语境。
4. 根据前文“Scientists are not sure whether plants could grow there.”，在无法种植新鲜食物的情况下，dried food（脱水食物）是合适的选择。
5. 根据前文“be dressed like an astronaut”和“breathe on Mars”，space helmet（太空头盔）是宇航员呼吸防护的必备装备，符合语境。
6. 根据“carry...on our back”和“They allow us to breathe on Mars.”，air tank（氧气罐）是背在背上提供呼吸所需氧气的设备，符合要求。
7. 根据“keep in touch with our family members and friends on the Earth”，computer（电脑）可实现星际通讯，符合语境。
8. 根据“provide enough energy”，power pack（电源组）是能提供能量的设备，符合要求。