题目内容
（请给出正确答案）
Aluminum is______.
A．lightweight, rustproof but not easily shaped into different forms
B．heavyweight, rustproof and easily shaped into different forms
C．lightweight, rustproof and easily shaped into different forms
D．lightweight and easily shaped into different forms but it is easy to become rusty
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It can be inferred from the fourth paragraph of the text that African optimism is______.
A．detrimental
B．fragile
C．transient
D．constant
If you need a transfusion, the best and safest blood for you is______.
A. type AB
B. exactly the same type as yours
C. a mixture of salt, plasma and type O
D. type A
The main reason that boys are seldom trained to follow their father's business is______.
A．that children also like to have jobs outside
B．that there is a wide choice of employment for children
C．that father do not like to pursue employment at home anymore
D．that children nowadays rarely see their places of work
Aluminum is found on earth mostly in the form. of______.
A．pure metal
B．bauxite
C．gold
D．liquid
What is a by-product of burned coal？
A. Aluminum, silicon, and magnetic.
B. Paving material.
C. Fly ash.
D. Concrete additive.
A．combined
B．having combined
C．combine
D．being combined
(The metal) aluminum (has been) (first) isolated (early) in the nineteenth century.
A．The metal
B．has been
C．first
D．early
What can be extracted from fine-powder fly ash？
A. Aluminum, silicon, and magnetic.
B. Additive.
C. Paving material.
D. Cement.
What is the passage talking about？
A．The features of aluminum and its functions.
B．The process of aluminum.
C．The discovery of aluminum.
D．The promising future of aluminum.
According to the passage, what material is required for lithography？
A．Rugged bark.
B．Coarse canvas.
C．Crinkled aluminum foil.
D．Smooth metal plate.
