1. Why do more and more people want to dive in the water now?
2. What will you find in the wonderful undersea world?
3. How can we stay in deep water for a long time?
4. What dangers do deep-sea animals have to face according to the article?
5. What food do these sea animals eat?

1. To find the secrets there.
2. Many strange animals.
3. Have bottles of air on our back.
4. Darkness, coldness and other animals.
5. Plants and meat.

五、首字母填空
How do you sleep? Most people sleep on their backs or sides. Do animals sleep the (1) way? Actually, the ways they sleep are much more different—they can lie down, sit or (2) while they sleep.
Swiss scientists did a study on 250 different mammals (哺乳动物). They (3) that the animals' sleeping postures (姿势) have something to do with their body size and (4).
Small animals with short legs sleep on their stomachs (趴着睡). Their body (5) is perfect for this posture. They also like to put their legs (6) their bodies. Rabbits and cats sleep this way.
But larger animals sleep differently. They (7) on their sides. That's because this is more (8) for their longer legs. Cows and hippos often sleep like this.
However, there are exceptions (例外). Small animals such as mice sometimes sit down to take a short nap. Some large animals such as horses, (9) and giraffes sleep standing up. This way, they can quickly run away if they are in (10).

1. same
2. stand
3. found
4. weight
5. shape
6. under
7. lie
8. comfortable
9. zebras
10. danger

1. 题目要求根据首字母在空格处填入合适的单词，使句子意思完整、语法正确。
2. 第一空，根据上文“Most people sleep on their backs or sides.”以及下文“Actually, the ways they sleep are much more different”可知，这里问的是动物是否和人类以同样的方式睡觉，“同样的”用“same”，故第一空填“same”。
3. 第二空，根据“they can lie down, sit or...”可知，这里说的是动物睡觉时的姿势，结合首字母“s”，可推测是“stand”（站立），表示动物睡觉时可以躺下、坐下或站着，故第二空填“stand”。
4. 第三空，根据“Swiss scientists did a study on 250 different mammals (哺乳动物). They...”可知，这里说的是科学家们的研究发现，“发现”用“find”，且文章是一般过去时，所以用“find”的过去式“found”，故第三空填“found”。
5. 第四空，根据“the animals' sleeping postures (姿势) have something to do with their body size and...”可知，这里说的是动物睡觉的姿势与它们身体的大小和什么有关，结合常识和首字母“w”，可推测是“weight”（体重），故第四空填“weight”。
6. 第五空，根据“Small animals with short legs sleep on their stomachs (趴着睡). Their body...is perfect for this posture.”可知，这里说的是小动物趴着睡时身体的特点，结合首字母“s”，可推测是“shape”（形状），表示它们的身体形状适合这种姿势，故第五空填“shape”。
7. 第六空，根据“They also like to put their legs...their bodies.”可知，这里说的是小动物睡觉时腿的位置，结合首字母“u”，可推测是“under”（在……下面），表示它们喜欢把腿放在身体下面，故第六空填“under”。
8. 第七空，根据“But larger animals sleep differently. They...on their sides.”可知，这里说的是大动物睡觉的姿势，结合首字母“l”，可推测是“lie”（躺），且文章是一般现在时，主语是“they”，所以用原形“lie”，故第七空填“lie”。
9. 第八空，根据“That's because this is more...for their longer legs.”可知，这里说的是大动物侧着睡的原因，结合首字母“c”，可推测是“comfortable”（舒服的），表示这种姿势对它们的长腿来说更舒服，故第八空填“comfortable”。
10. 第九空，根据“Some large animals such as horses,...and giraffes sleep standing up.”可知，这里说的是一些大动物站着睡觉，结合常识和首字母“z”，可推测是“zebras”（斑马），与马、长颈鹿一样，都是大型动物，故第九空填“zebras”。
11. 第十空，根据“This way, they can quickly run away if they are in...”可知，这里说的是大动物站着睡觉的原因，结合首字母“d”，可推测是“danger”（危险），表示如果它们处于危险中，可以快速逃跑，故第十空填“danger”。