填空题
Belgium has three main (36) regions: the coastal plain, the central plateau and the highlands. The coastal plain extends (37) 16 to 48 kilometers on the northwest. Along the north sea is a low-lying area (38) mainly of sandy hills and sections of land (39) from the sea. The coastal plain’s elevation ranges from sea level to 20 meters.
The central plateau is a (40) rolling, slightly elevated area, (41) by many water-ways and containing a number of wide, (42) valleys with a rich soil. The highlands, a densely-wooded plateau, (43) 460 meters in elevation, extend across southeastern Belgium and into northeastem France. Located here is the highest peak in Belgium with an elevation of 694 meters.
(44) . In the highlands, hot summers alternate with cold winters. Heavy rains are confined ahnost exclusively to the highlands. (45) In Brussels, the average temperatures range from zero to 5 degrees Centigrade in January and from 13 to 22 degrees Centigrade in July. (46)