30、Which city is the biggest city in America?___________________
29、A Chinese biologist wants to investigate penguins,he should go to the__
______
28、In“APEC”,“A”means______
27、Which number should appear next?
4, 10 ,22, 46 ,?______
26、It's black,but you say it is clean,It's white,but you say it is not clean.What is it?
___________________________________
25、ID______
24、Exit______
23、ATM______
22、PICC______
21、EMS______