The planet that moves round the Sun at the highest speed is?
A. Jupiter
B. Venus
C. Mars
D. Mercury
A. Jupiter
B. Venus
C. Mars
D. Mercury
A. River water
B. Canal water
C. Sea water
D. Water in a lake
A. Salt
B. Chlorine
C. Carbon dioxide
D. Water
A. 280,000 km/s
B. 300,000 km/s
C. 320,000 km/s
D. none of these
A. plasma
B. platelets
C. White blood cells
D. Red blood cells