During what period of time does the novel take place
A. 1400s.
B. 1700s.
C. 1800s.
D. 1900s.
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Where can the tallest trees be found
A. In Muir Woods.
B. Near Los Angeles.
C. In San Francisco.
D. Along the Northern California coast.
How many candidates were authorized by the interior ministry
A. 10.
B. 8.
C. 6.
D. 2.
According to the state media who will win the election
A conservative candidate.
B. President Mohammad Khatami.
C. Ayatollah Ali Khamenei.
D. Not mentioned.
微分方程（2x-xy2）dx=（6x+xy）dy是（）
A. 可分离变量的微分方程
B. 其次微分方程
C. 一阶线性其次微分方程
D. 一阶线性非齐次微方程
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