Which of the following is the main subject of the passage?
A.The importance of models in scientific theories.
B.The sorts of facts that scientists find most interesting.
C.The ways that scientists perform different types of experiments.
D.The place of theory and hypothesis in scientific investigation.

According to the second paragraph, a useful theory is one that helps scientists to .
A.observe events
B.publicize new findings
C.make predictions
D.find errors in past experiments

The word "supported" in paragraph 2 is closest in meaning to .
A.upheld
B.finished
C.adjusted
D.investigated

In the fourth paragraph, the author implies that imagination is most important to scientists when they .
A.formulate possible solutions to a problem
B.evaluate previous work on a problem
C.close an investigation
D.gather known facts

The word "obscurity" could best be replaced by .
A.qualification
B.disappearance
C.influence
D.tolerance

The word "them" refers to .
A.slang phrases
B.words
C.the majority
D.memories

The author mentions all of the following as requirements for slang expressions to be created EXCEPT .
A.a number of linguists
B.a new generation
C.interaction among diverse groups
D.new situations

It can be inferred from the passage that the author .
A.does not approve of colloquial usage in writing
B.approve of slang and colloquial speech in appropriate situations
C.does not approve of either slang or colloquial speech in any situation
D.approves of colloquial speech in some situations, but not slang

What surprises the writer about the popularity of Holiday on Ice?
A.Few people know someone who has seen it.
B.The show has not changed since it started.
C.Ice-skating is not generally a popular hobby.
D.People often say they prefer other types of show.

What does the writer highlight about the show in the third paragraph?
A.the variety of places in which the show has been staged
B.the range of companies involved in the production
C.the need for a higher level of professional support
D.the difficulty of finding suitable equipment