The ( 34 ) similarly of liquids and gases becomes clear ly apparent when the temperature and pressure are raised somewhat.( 35 ) a closed container partially filled with a liquid is heated. The li quid expands or ( 36 ), becomes less dense; some of it evapor ates.( 37 ), the vapor above the liquid surface becomes dense r as the evaporated molecules are added to it. The combination of temperature an d pressure ( 38 ) the densities become equal is ( 3 9 ) the critical point. Above the critical point the liquid and the gas can no longer be ( 40 ); there is a single, undifferentiated fluid phase of uniform density.
26. A. in B. on C. under D. beyond
27. A. fills B. be filled C. filling D. to fill
28. A. intends B. tends C. inclines D. contends
29. A. however B. nevertheless C. so D. therefore
30. A. in the event of B. in the case of C. with a view to D. with reference to
31. A. having described B. described C. describing D. to have described
32. A. made up of B. consisted of C. constituted of D. made from
33. A. apply B. adapt C. take D. conduct
34. A. elementary B. crucial C. rudimentary D. fundamental