Are the sentences True (T) or False (F)?
1. The sandstorm Haboob is common in China
2. Extreme dust storms cannot reduce visibility to zero
3. The dust storm in Sudan mainly happens in the autumn
4. Awful dust storms can stop visibility.
5. The dust storm can be transported only one hundred kilometers.
6. The dust can influence the people’s wellbeing.
7. The huge amounts of dust blowing across the moon
