Jae Kwon gave examples in Paragraph 4______.
A. to show chemical batteries are widely applied
B. to introduce nuclear batteries can be safely used
C. to describe a nuclear-powered system
D. to introduce various energy sources
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A visitor can apply for a free audio tour______.
A. in the Courtyard
B. in the State Apartments
C. at the Admission Center
D. at St George's Chapel
Which of the following is true of Jae Kwon？
A. He teaches chemistry at MU.
B. He developed a chemical battery.
C. He is working on a nuclear energy source.
D. He made a breakthrough in computer engineering.
For many years, people ______ electric cars. However, making them has been more difficult
A. had dreamed of
B. have dreamed of
C. dreamed of
D. dream of
Why are visitors required to turn off their mobile phones？
A. To ensure the safety of others.
B. To ensure the security of the Castle.
C. To prevent them from disturbing others.
D. To prevent the use of the built-in cameras.
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