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【单选题】
中国的富强和发展不会对任何国家构成威胁。A.
A strong, prosperous and developed China will pose no threat to any countries.
B.
The strength, prosperity and development of China will pose no threat to any countries.
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【单选题】在牙齿发育阶段，如果饮用水中氟含量高于百万分之一，或经其他途径摄入过多的氟，可导致釉质形成不全和钙化不全的是( )
A.
釉质发育不全
B.
氟牙症
C.
四环素牙
D.
牙本质发育不全症
E.
牙骨质发育不全症
【单选题】在牙齿发育阶段，如果饮用水中氟含量高于百万分之一，或经其他途径摄入过多的氟，可导致釉质形成不全和钙化不全的是
A.
釉质发育不全
B.
氟牙症
C.
四环素牙
D.
牙本质发育不全症
E.
牙骨质发育小全症
【单选题】Water is tasteless, odorless, and nearly colorless (it has a slight hint of blue). It is a【C1】______ that is essential to all known forms of life in its pure form. Water is【C2】______ on Earth. It exis...
A.
stance
B.
substance
C.
composition
D.
material
【单选题】The clear colorless liquid that falls as rain, fills lake and rivers, and is necessary for life
A.
287. The clear colorless liquid that falls as rain, fills lake and rivers, and is necessary for life to exist is______. A．oxygen
B.
petrol
C.
water
D.
Flood
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