填空题
Questions 35-39
Complete the summary below.
Write NO MORE THAN TWO WORDS for each answer.
Production of Rice Rice
gives more 35 per hectare than other cereal crops and production has increased over 100% in recent years because of better yields. Land area has only increased by 30% due to the need for wet land so availability of land is quite limited by 36 type and 37 supply. The dry-land variety gives poorer yields and poorer 38 No weed killers have been developed yet that do not harm the main crop. Heavy machines are unable to work in paddy fields so most rice is still grown 39.