It is acknowledged that Vietnam had a complete control over SARS from a very early stage of the epidemic.
A.Vietnam is acknowledged to have completely controlled SARS from a very early stage of the epidemic.
B.Vietnam is acknowledged to have controlled SARS from a very early stage of the epidemic.
C.Vietnam was acknowledged to have had a complete control over SARS from a very early stage of the epidemic.
D.Vietnam is acknowledged to have a complete control over SARS from a very early stage of the epidemic.

The purpose of any invention is to make our lives better, so good or bad, it depends on the way by which we use these inventions.
A.We can use either good or bad inventions to make our lives better.
B.Whether an invention is good or bad depends on the way by which we use it because the purpose of any invention is to make our lives better.
C.The purpose of any invention, whether good or bad, is to make our lives better. This depends on the way by which we use these inventions.
D.Good or bad as they are, all inventions have the same purpose: to make our lives better.

Transportation has been made much easier thanks to the invention of cars, but cars are the greatest contributor of air pollution.
A.It is cars that are the greatest contributor of air pollution although the invention of cars has made transportation much easier.
B.The invention of cars has made transportation much easier, but cars are among the greatest contributors of air pollution.
C.Although the invention of cars has made transportation much easier, people use cars to contribute to the pollution of air.
D.However easier the invention of cars has made transportation, it is cars that are among the greatest contributors of air pollution.

Choosing a suitable job is really important to adolescents.
A.It is really important to choose a suitable job for adolescents.
B.It is of great importance for adolescents to choose a suitable job.
C.Choosing a suitable job for adolescents is a really important affair.
D.The choice of a suitable job for adolescents is really important.

What might be inferred about radar?
A.It takes the place of a radio.
B.It has improved navigational safety.
C.It was developed from a study of sound waves
D.It gave birth to the invention of the airplane.

Which of the following would most likely be the topic of the next paragraph?
A.A history of flying.
B.Other uses of radar.
C.The technology used by pilots.
D.Uses of some technology.

Which type of waves does radar use?
A.tidal
B.sound
C.heat
D.radio

Which of the following words best describes the tone of this passage?
A.argumentative
B.explanatory
C.humorous
D.imaginative

The word “exemplified” in the passage can be replaced by _______.
A."specified”
B.“resembled”
C.“illustrated”
D.“justified”

According to the passage, what can radar detect besides location of objects?
A.Shape.
B.Size.
C.Speed.
D.Weight.