1．Trees make our life better in many ways.As trees need CO₂ when they （1）/gr??/，they take in CO₂ so that there will be less of it in the air.Also，trees can give off O₂，which is （2）/nes?s?r?/for all living things on the earth.
    Trees and forests play an important part in（3）（help） to improve our environment.They can stop the soil （4） being washed away.They can make water better and the air （5）（clean）.At the same time，forests are the home of many （6），such as tigers，elephants，monkeys and so on.
    However，forests all over the world are becoming fewer and fewer.People cut down trees to make paper，build houses or do other things.Every minute，between 50 and 100 acres（英畝） of forests are （7）（destroy）.If this goes on，there will be no forests left in one hundred years.
    Luckily，many countries have come to realize the （8）（important） of forests.They pass laws to （9） /pr?'tekt/ the forests.For example，in some countries， （10） people cut down one tree，they will plant another tree or more trees.

2．About 2，400 years ago in ancient Greece，Aristotle was born.It was a period when the Greeks highly respected great thinkers and teachers，such as Pythagoras，Socrates，Democritus，and Plato.Many historians believe that Aristotle was greater than all of them.
    Aristotle is called "the father of biology."Many of his discoveries are still considered correct today.For example，it was Aristotle who first wrote that dolphins are not fish-through close observation，he had found out that they give birth to their babies rather than laying eggs，and that mother dolphins feed milk to their young.
    Aristotle's way of grouping animals may have been his most important achievement.in biological science.Experts used his system for over 2，000 years.In 1758，a Swedish scientist discovered a new way of grouping animals.Aristotle placed the animals into two groups：those with blood and those without.In fact，his way of grouping，though a little bit different，was approximately the same as the modern grouping system of vertebrates and invertebrates.
    Professor Nardo wrote："Although Aristotle paid much attention to the importance of evidence（證據(jù)），he failed to realize that doing experiment is almost always the best method of finding it.Yet，when he did simple and basic experiments，Aristotle was able to make mostly correct conclusions."
    He also wrote that"Aristotle's influence on the future growth of knowledge was both negative and positive..." For example，Aristotle believed that the planets went around the Earth ，not the Sun.Because the later scientists believed in him blindly，their progress in astronomy was stopped.However，he added that many of Aristotle's ideas brilliantly provided directions for modern discoveries.

（1）Which of the following statements is true？
A.Pythagoras，Socrates，Democritus，and Plato were not highly respected.
B The ancient Greeks believed that Aristotle was the greatest thinker.
C.Aristotle made great contributions to the development of biology.
D.Aristotle believed dolphins are not fish because they lay eggs.
（2）Why is Aristotle called "the father of biology"？
A.He discover that dolphins feed milk to their young.
B.He was the first man to find that dolphins are not fish.
C.People consider him greater than all the other thinkers.
D.People still accept many of his discoveries on biology.
（3）What did Nardo think of Aristotle according to the passage？
A.Aristotle failed to realize the importance evidence.
B.Aristotle's finding stopped people studying astronomy.
C.Aristotle found the best way to make current conclusions.
D.Aristotle's ideas were helpful to modern discoveries in a way.

3．The Royal Hotel is the closest to the sea，so it is very popular.But it is expensive，so it is not the（1）there.It has the（2）swimming pool，but most of the guests go swimming（3）the sea.
   The Promenade Hotel（4）the most popular restaurant in the town.The food is the best and the（5）give the friendliest service.It has the smallest swimming pool，and the swimming pool is very popular，（6）the pool is the most crowded.
   The Super Hotel is in the city，so it is the busiest hotel.Its（7）are the richest and the rooms and the swimming pool（8）the most comfortable.This hotel is the most expensive one in（9）country.
   There are some other hotels around，such as Lucy's Hotel，but they are just for guests（10）a sleep，and they are cheap.

（1）A.crowded	B.more crowded	C.most crowded
（2）A.big	B.biggest	C.bigger
（3）A.in	B.on	C.under
（4）A.have	B.has	C.had
（5）A.waiters	B.waiter	C.wait
（6）A.and	B.so	C.though
（7）A.guest	B.guests	C.a guest
（8）A.be	B.is	C.are
（9）A.the	B.a	C.an
（10）A.has	B.had	C.to have