Another method is to place several cloth bags on top of each other in a box. Then a long wooden stick is used to slowly push a heavy cover down on the bags. Great pressure is produced in this way. Much greater pressure can be produced by using a machine，a hydraulic jack (液压千斤顶)．The greater the pressure is，the more oils will be produced.

　　Small presses are important in areas where electricity or gasoline cannot be used. They are also a good way to test if a local market for oils exists.

　　Small batch presses can be made of local materials. Their cost is low. They are not difficult to operate. And they are easy to repair. The small presses produce good quality oils. But the work is hard. And getting all the oil from the seeds can be difficult.

　　If there is a large supply of seeds，then hand-operated presses may not be enough to support a business. Large powered presses that can operate all day are needed.

　　Title How to (1) ______Oils from Seeds

　　(2) ______

　　of oils People use oils when they cook meals，paint pictures and clean objects.Method 1 ◆Crush the seeds between two stones and then put them into a cloth bag.

　　◆(3)_______ the cloth bag up. Some of the oil will flow out of the bag.

　　◆The (4)_______oil in the seeds can be got by putting more heavy rocks on them.

　　Method 2 ◆A box is used to (5) _______several bags of seeds.

【2016高考英语一轮复习方略 素能提升演练选修7 Unit19（北师大版）】相关文章：

★ 2016年高考【英语】学科试题评析（四川卷）

★ 安徽省淮南市2014高考英语一轮单项选择及文章训练（11）及答案

★ 2014高考英语（新人教版）一轮基础训练（9）A、B卷（附答案或解析）

★ 2014届高考英语一轮复习选修6参考答案（外研版）

★ 2017届高考英语二轮复习课时训练：22（含解析）

★ 【浙江专用】2014届高考英语一轮复习课时作业(三十一)选修7Unit 1《Living well》

★ 【浙江专用】2014届高考英语一轮复习课时作业(十九)必修4Unit 4《Body language》

★ 2017届高考英语二轮复习课时训练：16（含解析）

★ 2017届高考英语二轮复习大题冲关秘籍完形填空之记叙文：名校模拟（含解析）

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（4）模块2 《Unit 4 Cyberspac》（含解析） 北师大版必修1