若显微镜的油浸镜上的油已干,可用拭镜纸沾何物擦净,然后再用干净擦拭镜纸擦干净()
A.清水
B.石蜡
C.无水乙醇
D.二甲苯
E.以上都不是
参考答案:C
—What’ s the low-carbon life style like? .
—Save energy, produce carbon.
A.more; more
B.less; more
C.less, less
D.more; less