和第四段第一句可知，他被命令狙杀一位母亲，但他认为这位母亲是无辜的，所以没有开枪。他因此而被送进了监狱。由此可知，他是因为拒绝执行命令而坐牢的。
答案：C
23．解析：推理判断题。根据第四段中无家可归者所说的话和最后一段第一句可推知，这位狙击手宁愿坐牢，也不愿执行枪杀无辜者的命令，这使作者觉得他是个英雄。
答案：B
24．解析：推理判断题。根据第四段中他所说的话可知，虽然他因为那件事而被关进了监狱，但他并没有为此感到后悔，他觉得滥杀无辜是不对的。由此可推知，他认为他的做法是对的。
答案：D
B
Human beings can use language to communicate, but what about animals? How do they communicate with each other without using language? Well, different animals use different types of communication.
Sounds are one of the most common types of communication in animals. Bats usually follow sound waves to communicate. Birds communicate through their chirping (唧唧叫). Mammals generally use sounds to give calls to other members of their community, and whales are good at using sound waves.
Besides sounds, facial expressions are also used by animals. For example, when dogs are angry, they show their teeth barking and raise their ears. When they're frightened, they pull their ears behind with the mouth open. For another example, when the parent bird brings food for the baby bird, the “begging expression” can be observed on its face.
Next, gestures and body movements are also common in animals. For example, honey bees dance to communicate. A deer waves its tail to warn others of some danger coming closer. A gorilla sticks its tongue out to express anger.
Many animals communicate through smells. They all give off pheromones (信息
素) to express messages to other animals. Wolves, deer and insects generally use this type of communication. Even amoebas need to communicate and do it by giving out chemical. The animals use this type of communication to attract others for reproduction (繁殖)．
Besides the above means of communication, some animals communicate by touching each other. For example, monkeys express feeling by touching each other's hands, and they even give hugs and kisses to express love.
25．Why does the author use the two questions in Paragraph 1?
A．To introduce the topic. B．To give some examples.
C．To stress the importance of language.
D．To show the differences between humans and animals.
26．We can learn from the passage that ________.
A．most animals use their smells to attract others
B．a deer will wave its tail once it senses danger
C．bats are better at using sound waves than whales
D．a gorilla sticks its tongue out when it's frightened
27．Which of the following best shows the structure of the passage?
(①＝Paragraph 1... ⑥＝Paragraph 6)
答案与解析：
本文是一篇说明文，主要介绍了动物之间进行交流的五种载体：声音、面部表情、肢体动作、气味和身体接触。
25．解析：推理判断题。第一段中用两个问句引出了本文的话题：动物是如何进行交流的。
答案：A
26．解析：细节理解题。根据第四段第三句可知，当鹿觉察到危险时，它会摆尾巴。
答案：B
27．解析：篇章结构题。文章第一段首先指出动物有不同的交流方式，第二至六段分别介绍了五种交流方式，因此D项最能体现本文的结构。
答案：D
C
Every day thousands of people travel across the world for different reasons. Whenever I've checked in for a flight, I've seen many travelers saying, “I missed it”， “I forgot it”， etc. This happens because while packing our bags, we miss so many important things.
The baggage packing isn't a big job but many people see it as a messy job. I'll advise you to always pack your bags according to your trip. The baggage should be different according to the duration (持续时间) of your trip. You