Part a: which of the following statements best describes a central idea of the text?

a
in the early 1500s, a strange illness caused many townspeople to experience muscle spasms that made them look like they were dancing.
b
in the early 1500s, a group of townspeople began dancing for no apparent reason and, even more troubling, they could not stop.
c
only until very recently, the dancing plague of 1518 was considered a myth, one with very little evidence to support its existence.
d
in medieval france, it was customary for dancing festivals to last days, even weeks, often leading to exhaustion and occasionally death.

Arrange the sentences below to form a logical paragraph.an experienced rock climber knows that it takes a combination of knowledge and preparation to perform a successful climb.a successful climb begins with a proper foothold, carefully placing each foot on a ledge or crack then reaching for a solid hold, and finally pushing off.in addition to a proper foothold, a climber must be careful to check the integrity of the rock before stepping because it has to be solid clear through.a veteran climber judges the integrity of the rock and chooses not to climb on conglomerates, packed clay with lots of little rocks.but, such knowledge of rock is not the only preparation a skilled climber needs; equally important is the correct equipment.with these tools, knowledge of rock composition and equipment safety, a climber may experience many safe and enjoyable climbs.