Which of the following is not a primary organ of the digestive system（）
A. liver
B. stomach
C. large intestine
D. pharynx
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Which event marks the end of the Wars of the Roses（）
A. Battle of Bosworth Field
B. Campaign between Spanish Armada and English Navy
C. Dissolution of the Monasteries
D. English Renaissance
Fruits are a good source of which nutrients（）
A. Vitamins, carbohydrates, and minerals
B. Fats, carbohydrates and fiber
C. Minerals, vitamins, and fiber
D. Protein, fiber, and vitamins
In eutrophic lakes, which conditions are conducive to the growth of algae（）
A. Increase in pH
B. Decrease in pH
C. Increase in dissolved oxygen
Decrease in dissolved oxygen
The generation of dust-haze is the result of many factors, including（）
A. The friction coefficient of the ground increases due to the large buildings in the city
B. The urban heat island effect makes it difficult for the pollutants to circulate and spread in a small range
C. The vertical inversion of the atmosphere makes the pollutants stay near the ground
D. The rapid development of industry increases the emission of particles
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