位于平面直角坐标系上第四象限的点是[ ]
A.(3,﹣4)
B.(3,2)
C.(﹣4,3)
D.(﹣5,﹣2)
答案:C
Now medical authorities express their ______ about the effect of smoking on people's health.[ ]
A. consideration
B. attention
C. belief
D. concern
2013年,西南中南各省市借道广西出海的货物吞吐量占广西沿海港口吞吐量的60%左右。