答案:B
甲地(0°、90°E)、乙地(60°N、 90°E)、丙地(0°、40°E)、丁地(60°S、40°W)与本初子午线的距离最近的是:
A.甲
B.乙
C.丙
D.丁
Clean water and fresh air are essential for our daily life, _______ we can't live.[ ]
A. by which
B. without which
C. that
D. on which