The contrast drawn between the Haicheng earthquake in Paragraphs 2 and 3 and the Tangshan earthquake in Paragraph 3 contributes to a central idea that earthquakes are
А
all preceded by reliable signs, and therefore scientists have the ability to predict
earthquakes.
B
controlled by observable factors that just average citizens can report to the
authorities.
с
not always predictable, so new methods and more studies need to be
conducted
D
not often studied because there is no possible solution to the problem of
predicting earthquakes.

answer: hjnh

explanation:

hhjjk

yes, we appreciate these things!

i decided to stay late in the laboratory to continue my experiment with the lightbulb. at midnight, thomas edison opened the door and saw all the stuff he was working on. the lightbulb, film and the transmitter. as he walks in an idea hits him on how the lightbulb would work. he would have to change a few wires around to get it to light up. when he did change the wires around it worked so he decided to write a telegraph to his friend to tell him about his success.   as he was packing up he grabbed the telegraph and walked to his home. he told his wife about the success and the next morning mailed the telegraph.