【正文】
. in。 at D. with。s the c of America. 17. The growing population is one of the biggest c of the world today. 18. If we go on cutting down trees, the land will turn into a d . 19. We should solve the problem in a p way. 20. The conference has developed t and friendship between China and Russia. 21. That table came from Tang Dynasty (唐朝 ). It is an a table. 22. Guangzhou is the c of Guangdong as Wuhan is that of Hubei. 23. This is a chance, but it39。t find a p pen to write with. 26. A t in books can make more people learn to read. 27. There are many a things in the museum. 28. It is wellknown that Beijing is the c of China. 29. The plan will give us a new c . We must try our best to do it. 30. The Sahara is the largest d in the worl