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【单选题】
带轮最常用的材料是A.
铸铁
B.
钢
C.
铝合金
D.
塑料
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皮皮学刷刷变学霸
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【单选题】We can learn from Paragraph 4 that______.
A.
ships without crew will soon replace traditional ones
B.
most air crashes are caused by operational mistakes
C.
erewless ships are favoured just because of safety
D.
human hands are more reliable than computers
【简答题】阅读理解 In a world with limited land,water and other natural resources,the harm from the traditional business model is on the rise.Actually,the past decade has seen more and more forests disappearing and...
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