Melamine is a chemical that is usually used to make plastics, but is

　　1

　　in the food industry. It was put in the milk to make milk appear rich in protein in

　　2

　　tests.

　　Tests of last Thursday showed that products from 22 of the 109 milk food firms have

　　3

　　the quality tests of the General administration of Quality supervision, Inspection and Quarantine ( 国家质检总局). 24 of the 1,202 batches批次 of liquid milk were contaminated. Besides Hebeibased Sanlu Group, the firms whose products are contaminated include such

　　4

　　giants as the Yili and Mengniu groups. All the bad milk will be

　　5

　　and destroyed.

　　However, scientists were quoted as saying the contamination level in liquid milk did not pose a big threat to people's

　　6

　　.

　　Even milk with the highest concentration of melamine is

　　7

　　for a 60-kilogram or heavier adult if he or she drinks up to 2 liters a day.

　　The administration has ordered a thorough investigation into all the firms with

　　8

　　and said quality control officers would be sent to all 1,500 dairy farms in the country to carry out

　　9

　　.

　　So next time you buy milk, take a look at its

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