There are two general types of sand: naturally bonded and .

Duty-free goods are imported and stocked in bonded warehouse.

_____ is covered with heavy snow. A: The earth’s surface B: The surface of earth C: The surface earth D: The earth surface

Generally speaking, the functions of a pilot free trade zone are almost the same with those of a bonded zone in China at present.

The earth _______ round the sun, and the moon _________ round the earth

______ is the center of our planetary system was a difficult concept to grasp in the Middle Ages.(1.0) A: It is the sun and not the earth B: Being the sun and not the earth C: The sun and not the earth D: That the sun and not the earth

The purpose of Earth Day is ______. A: to help people memorize the earth B: to help people to learn how to protect the earth C: to unite all the people on the earth D: all of the above

One day on the moon is ______. A: two Earth week long B: two Earth weeks long C: two Earth weeks longer D: two Earth weeks length

____isthe center of our planetary system was considered as heresy by the church in the Middle Ages. A: It is the sun and not the earth B: That the sun and not the earth C: Being the sun and not the earth D: The sun and not the earth

Ionic bonded materials are characterized by the following properties except . A: hard B: brittle C: conductor D: high melting temperature