【单选题】The common cold is the world's most widespread illness, which is probably why there are more myths about it than any of the other plagues that flesh is heir to. The most widespread fallacy of all is t...
A.
it spreads more quickly
B.
it is the most widespread illness
C.
the climate of the world is getting colder and colder
【简答题】Many man-made substances are replacing certain natural materials because either the quantity of the natural products can’t meet our ever-increasing requirement, or more often, because the physical pro...