利用点火提前角闭环控制系统，有效地控制点火提前角，使发动机工作在爆燃的临界状态。（ ）
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根据以下句子，选出最符合句意的一个单词。Different from his usual simple style, Spencer’s new book is a very______work.
A. legitimate
B. luxious
C. lovely
D. logical
This passage mainly tells us about:
A. The experience of Thomas Jefferson
B. The development ofBritish colony
C. The history of the United States
D. The origin of Independence Day
According to the text, why was the United States separate from the Great Britain?
A. Because the Great Britain offered to do so
Because of the abuses by the British Government
C. Because Thomas Jefferson thought it was a right choice
D. Because of the differences of culture and national ideology
According to the text, which of the following statements iswrong?
A. Independence Day is to commemorate the signing of the Declaration of Independence
B. Thomas expressed worries about the future of the United States.
C. The Revolutionary War ended with the birth of the United States of America
D. Thomas spoke highly of the Declaration of Independence
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