你所在考室内的空气质量最接近（空气密度约1.3 kg/m³） [ ]

A.1.5 kg

B.15 kg

C.150 kg

D.1 500 kg

If you are not familiar ____ the topic, you may write something that is familiar ____ you. [      ]

A. with; with  

B. to; to  

C. to; with  

D. with; to