精英家教网 > 高中英语 > 题目详情

It is difficult to cross the desert by car, but not a           impossible.

练习册系列答案
相关习题

科目:高中英语 来源: 题型:

―Could I hand in my composition after class?

―Of course, you _____.

A.might                      B.will                C.can               D.should

查看答案和解析>>

科目:高中英语 来源: 题型:

upset                     A. cubic                B. trust                  C. altitude              D. unique

查看答案和解析>>

科目:高中英语 来源: 题型:阅读理解

America hopes to start building a base that can contribute to exist all the time on the moon within 20 years. By the mid-2020s, astronauts will be staying there for six months a time. So what do scientists think food and water will be like for those first moon residents?

In the short term, food would have to be brought from Earth. The dream, however, is to grow things in greenhouses on the moon. “You’d grow things in liquid---there’s no reason why that wouldn’t work,” says Pillinger, a professor. This would mean floating plants in a nutrient-rich solution of water. “Soil is not a necessary thing for plants; it’s only to keep them standing upright,” Pillinger adds.

It would take at least a decade of experiments after the base was built before such a plan would work, however. The main problem is working out how to get nutrients from the lunar(月球的) soil. “Getting all that to work requires a minimum level of infrastructure(基础设施)present before you can start experimenting with greenhouses,” says Pillinger.

Finding strong plants to grow in space will also be hard, though scientists are already working on it: scientist Amy Grunden of North Carolina State University has been working on genetically engineering food crops that can be grown in hars, off- planet environment.

Water is a somewhat easier prospect(前景). One of the reasons that America wants to put its base at the moon’s south pole is that it thinks that, in the permanently shaded craters, there are large pools of frozen water. If that is true, it could easily be mined and used to drink and to create oxygen for the habitants.

 

41. The passage is mainly about______.

A. life on the moon by 2020 

B. America’s first moon base that exists forever

C. food and water on the future moon base 

D. housing for settlers on the future moon base

42. How do people plant on the moon in the future?

  A. By burying plants in the lunar soil

  B. By growing plants in water.

C. By keeping plants standing straight.

D. By making use of the moonlight

 43. What difficulty will scientists meet in solving the food problem?

   A. How to find water to irrigate plants.

   B. Where to experiment with plants.

   A. How to grow plants in the moon soil.

   D. What plants are suitable to grow in the moon

44. Scientists want to build the base on the moon’s south pole because_______.

   A. there is oxygen for people to breathe

   B. people have found the frozen water that can be drunk there

   C. it is a place where water will possibly be found and supplied

   D. there are large pools that can let people have a swim.

查看答案和解析>>

科目:高中英语 来源: 题型:

He admits that he has a __________(偏见) against women drivers

查看答案和解析>>

科目:高中英语 来源: 题型:

---How did you know about it?                  

---I heard it ____ the radio.

A. in                             B. at                                    C. on                    D. for

查看答案和解析>>

科目:高中英语 来源: 题型:

Among them I like this kind of food ______, for it is ______ sugar and water.

A. best, mostly                     B. best, most                       C. most, best         D. most, mostly

查看答案和解析>>

科目:高中英语 来源: 题型:

China won 32 gold m______ in Athens Olympic games.

查看答案和解析>>

科目:高中英语 来源: 题型:

F____________, a kind and brave peasant passed there and saved the wounded soldier.

查看答案和解析>>

同步练习册答案