2．What does the underlined part "Monkeys wipe the floor with dogs" in Paragraph 4 mean?

A．Monkeys are cleaner than dogs.

B．Monkeys perform better than dogs.

C．Monkeys have learnt to clean floors.

D．Monkeys like to compete with dogs.

B　解析：句意理解题。由划线部分下文中的Dogs may have to try hundreds of times...more quickly to find the hidden treat.可知，猴子比狗更快找到食物， 由此可以推断，"Monkeys wipe the floor with dogs"意为"猴子比狗表现得好"。

3．According to Paragraph 5, how are monkeys and dogs different?

A．Monkeys learn quickly but dogs learn slowly.

B．Monkeys like taking tests but dogs dislike them.

C．Monkeys do not like working with humans, but dogs do.

D．Monkeys explore new things but dogs shy away from them.

D　解析：推理判断题。由第五段中的monkeys are curious...be cautious about approaching new things可知， 猴子对新事物充满好奇， 而狗对新事物总会小心翼翼。

4．According to the text, which of the following statements is TRUE?

A．The smartest animals make the best pets.

B．Most animals are as smart as they need to be.

C．Animals can do what humans want them to do.

D．Bigger animals are smarter than smaller animals.

B　解析：细节理解题。由最后一段中的All animals have the ability to learn things that are important to them.Otherwise they wouldn't survive.可知， B项正确。

完形填空

　　It was only in the eighteenth century that people in Europe began to think mountains were beautiful.__1__that time，mountains were__2__by the people living on the plain，__3__by the city people, to whom they were wild and__4__places in which one was easily__5__or killed by terrible animals.

　　Slowly, however, many of the people who were living__6__in the towns began to grow tired of__7__. They began to feel interested in looking for things which could not be explained, for sights and sounds which produce a feeling of fear and excitement.__8__， in the __9__century, people began to turn away from the manmade__10__to the untouched country，and particularly__11__places where it was dangerous and wild. High mountains began to be __12__ for a holiday.

Then, mountain climbing began to grow popular as a sport. To some people, there is something greatly__13__about getting to the__14__of a high mountain：a struggle against nature