[单项选择]He______two thousand trees since 2001.
[A] planted [B] has planted [C] will plant

[单项选择]Nearly two thousand years have passed since a
census decreed by Caesar Augustus became part
of the greatest story every told. Many things have
Line changed in the intervening years. The hotel indus-
(5) try worries more about overbuilding than over-
crowding, and if they had to meet an unexpected
influx, few inns would have a manger to accom-
modate the weary guests. Now it is the census
taker that does the traveling in the fond hope that
(10) a highly mobile population will stay put long
enough to get a good sampling. Methods of gath-
ering, recording, and evaluating information have
presumably been improved a great deal. And
where then it was the modest purpose of Rome to
(15) obtain a simple head count as an adequate basis
for levying taxes, now batteries of complicated
statistical series furnished by governmental agen-

A. a journal of biblical studies
B. an introductory college textbook on statistics
C. the annual report of the American Statistical Association
D. a newspaper review of a recent professional festivity
E. (E) the current bulletin of the census bureau

[单项选择]Nearly two thousand years have passed since a census decreed by Caesar Augustus became part of the greatest story ever told. Many things have changed in the intervening years. The hotel industry worries more about overbuilding than overcrowding, and if they had to meet an unexpected influx, few inns would have a manger to accommodate the weary guests. Now it is the census taker that does the traveling in the fond hope that a highly mobile population will stay put long enough to get a good sampling. Methods of gathering, recording, and evaluating information have presumably been improved a great deal. And where then it was the modest purpose of Rome to obtain a simple head count as an adequate basis for levying taxes, now batteries of complicated statistical series furnished by governmental agencies and private organizations are eagerly scanned and interpreted by sages and seers to get a clue to future events. The Bible does not tell us how the Roman census takers made out, and as regar
A. mobility
B. wealth
C. population
D. census takers

[填空题]Since rainforest bacteria and trees depend on each other for life, the relationship they from is termed ______.

[填空题]Since rainforest bacteria and trees depend on cacti other for life, the relationship they form is termed______.

[单项选择]Since the earliest times, trees have always been very useful and important to man who made use of them in numerous (众多的) ways for his daily life. Even today trees continue to serve man in so many useful ways.
Trees provide man with food, fuel for burning and building material in the form of wood. Without trees it would be impossible to build houses, boats and even bridges. Furniture such as tables, chairs and cupboards are also made from wood.
In the tropics (热带) where it is very warm throughout the year, trees protect man from the fierce heat of the sun. They are useful in preventing good and fertile top soil from being washed away during heavy rains which are so common in the tropics.
If there are no trees or vegetation (植物) of some sort to hold back the soil with their roots, heavy rains would wash away the rich surface soil so essential for agriculture. The result is that the land becomes useless and unproductive.
There are many desert areas in the world. A long
A. fertile lands
B. covered by rivers
C. very cold
D. very dry and useless lands