税收的固定性既包括时间上的连续性，又包括征收比例的固定性。 ()
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The main purpose of the first paragraph is ______.
A. to describe the heroic and successful struggle for independence waged by the slaves of St. Domingues
B. to show how huge numbers of Africans populated the Americas
C. to show that Africans had a vital part to play in laying the foundations of the American republics
D. to describe the horrors of the overseas slave trade
一个人对行为控制与调节方面的特征是属于性格的态度特征。()
A. 正确
B. 错误
中国证券业协会应当制定证券评级机构的自律准则和执业规范，对违反自律准则和执业规范的行为给予行政处分。()
A. 正确
B. 错误
What kind of disease could not be caused by the use of mobile phone？
A. Fatigue.
B. Headache.
C. Alzheimer's disease.
D. Tuberculosis.
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