The snowstorm brought disaster to ________ people.
A：thousands of
B：thousands
C：thousand of
D：thousand
36的平方根是____ ；16的算术平方根是____ ；-273=____
The natural beauty of Mount Tai_____millions of tourists from all over the world every year.
正三棱锥的高和底面边长都等于6，则其外接球的表面积为（ ）
