—What is the main cause of the accident?

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问题选择题

—Driving _____.[ ]

A. careful

B. carefully

C. careless

D. carelessly

答案

答案：D

选择题

13. For many cities in the world, there is no room to spread out further, _______ New York is an example.

14.

A．for which

B．in which

C．of which

D．from which

选择题

下列叙述正确的是 [ ]

A.因为Na₂CO₃+SiO₂Na₂SiO₃+CO₂↑，所以硅酸的酸性比碳酸强

B.碳和硅都是ⅣA族的元素，所以二氧化碳和二氧化硅的物理性质相似

C.二氧化硅既溶于氢氧化钠溶液又溶于氢氟酸，所以二氧化硅是两性氧化物

D.二氧化硅是酸的酸酐，但不与水反应产生硅酸