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【简答题】
Why does the author mention gunpowder in Paragraph 3? [A] To remind readers that the colonial era ended in warfare. [B] To give an example of a product made from wood consumption. [C] To illustrate some negative aspects of some industrial processes. [D] To suggest that wood was not the only important product of the colonies.
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反馈参考答案：
举一反三
【简答题】全加器与半加器的区别为( )。 A . 不包含异或运算 B . 加数中包含来自低位的进位 C . 无进位A. B
【单选题】It took me _____to find out the key to the drawer. [ ]
A.
one and half hours
B.
one and a half hours
C.
one and a half hour
D.
one and half hour
【单选题】关于我们水资源污染描述错误的为
A.
据环境部门监测,全国城镇每年至少有1亿吨污水未经处理直接排入水体。
B.
全国七大水系中一半以上河段水质受到污染,全国1/3的水体不适于鱼类生存,1/4的水体不适于灌溉,
C.
90%的城市水域污染严重,50%的城镇水源不符合饮用水标准,40%的水源已不能饮用,
D.
我国南方城市总缺水量的60%—70%是由于水源污染造成的。
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