[填空题]Fifty years ago, wealthy people liked hunting wild animals for fun _________________ (胜过四处观光)

[简答题]Fifty years ago, wealthy people liked hunting wild animals for fun ________ (胜过四处观光)

[单项选择]Fifty years ago, wealthy people liked bunting wild animals for fun ________ sightseeing.
A. than to go
B. rather than to go
C. more than going
D. other than going

[填空题]In old times, wealthy people liked hunting wild animals for fun ______ (胜过四处观光).

[单项选择]

About fifty years ago, plant physiologists set out to grow roots by themselves in solutions in laboratory flasks. The scientists found that the nutrition of isolated roots was quite simple. They required sugar and the usual minerals and vitamins. However, they did not require organic nitrogen compounds. These roots got along fine on mineral inorganic nitrogen. Roots are capable of making their own proteins and other organic compounds. These activities by roots require energy, of course. The process of respiration uses sugar to make the high energy compound ATP, which drives the biochemical reactions. Respiration also requires oxygen. Highly active roots require a good deal of oxygen. The study of isolated roots has provided an understanding of the relationship between shoots and roots in intact plants. The leaves of the shoots provide the roots with sugar and vitamins, and the roots provide the shoots with water and minerals. In addition, roots can provide the shoots with organic
A. The results of two experiments are compared.
B. A generalization is made, and several examples of it are given.
C. The findings of an experiment are explained.
D. A hypothesis is presented, and several means of proving it are suggested.