[单项选择]Gases differ from solid in that the former have greater compressibility than the latter.


A. 气体与固体的区别在于前者比后者有更大的压缩性。
B. 气体与固体是有区别的，前者比后者有更大的压缩性。
C. 气体与固体是有区别的，前者比后者更能压缩。
D. 气体与固体在压缩性上是没有区别的。

[单项选择]Gases differ from solid in that the former have greater compressibility than the latter.


A. 气体与固体的区别在于前者比后者有更大的压缩性。
B. 气体与固体是有区别的，前者比后者有更大的压缩性。
C. 气体与固体是有区别的，前者比后者更能压缩。
D. 气体与固体在压缩性上是没有区别的。

[单项选择]When animals are fleeing in panic they have the greatest need to "follow the flag" of their own species, keeping the ______ together.
A. swarm
B. group
C. team
D. herd

[单项选择]It can be inferred from the passage that the gases of the Earth's atmosphere are contained by ______.


A. a closed surface
B. the gravity of the planet
C. the field of space
D. its critical point

[单项选择]Gases are not like solids（）they have an infinite volume.
A. at that
B. with that
C. for that
D. in that

[单项选择]

Text 1
Scholars and students have always been great travelers. The official case for "academic mobility" is now often stated in impressive terms as a fundamental necessity for economic and social progress in the world, and debated in the corridors of Europe, but it is certainly nothing new. Serious students were always ready to go abroad in search of the most stimulating teachers and the most famous academies; in search of the purest philosophy, the most effective medicine, the likeliest road to gold.
Mobility of this kind meant also mobility of ideas, their transference across frontiers, their simultaneous impact upon many groups of people. The point of learning is to share it, whether with students or with colleagues; one presumes that only eccentrics have no interest in being credited with a startling discovery, or a new technique. It must also have been reassuring to know that other people in other parts of the world were about to make the sam
A. salaries and conditions are better abroad.
B. standards are higher at foreign universities.
C. they are eager for new knowledge.
D. their governments encourage them to travel.

[单项选择]The computer of the airports have helped people greatly. ______, more people travel by plane in Chin
A. A． In factB. At leastC. At one timeD. As a result

[单项选择]

Text 3
Scholars and students have always been great travelers. The official case for "academic mobility" is now often stated in impressive terms as a fundamental necessity for economic and social progress in the world, and debated in the corridors of Europe, but it is certainly nothing new. Serious students were always ready to go abroad in search of the most stimulating teachers and the most famous academies; in search of the purest philosophy, the most effective medicine, the likeliest road to gold.
Mobility of this kind meant also mobility of ideas, their transference across frontier, their simuhaneous impact upon many groups of people. The point of learning is to share it, whether with students or with colleagues; one presumes that only eccentrics have no interest in being credited with a startling discovery, or a new technique. It must ’also have be6n reassuring to know that other people in other parts of the word were about to make the
A. articles in learned journals
B. programmes initiated by governments
C. friendships formed by scholars at meetings
D. the work of international agencies