Choose the word or phrase that best completes each sentence about ancient Chinese trade. One reason silk was a valuable export was because it had .
The connected China to Europe for trade.
After centuries of isolation, the Silk Road connected China to .

I know this is late but for anyone else who is struggling with this question, look at the screenshot attached.

Explanation:

EDGE 2022.

the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.

i see, would you mind putting it as one?