Blues is a type of music of strong rhythm, which was originally sung by （）.

A．There is no evidence that the planet is suitable for human existence.
B．There may be several planets that really resemble the Earth in space.
C．Scientists are planning to explore the planet someday.
D．Astronomers have landed on an Earth-like planet in space.

A．People should drink at regular intervals.
B．People should refrain from drinking too much for too long.
C．People should drink only on special occasions.
D．People should give up the bad habit of drinking alcohol.