2019年公共英语四级阅读练习题（7）

 　　If a farmer wishes to succeed, he must try to keep a wide gap between his consumption and his production. He must store a large quantity of grain 41 consuming all his grain immediately. He can continue to support himself and his family 42 he produces a surplus.He must use this surplus in three ways: as seed for sowing, as an insurance 43 the unpredictable effects of bad weather and as a commodity which he must sell in order to 44 old agricultural implements and obtain chemical fertilizers to 45 the soil. He may also need money to construct irrigation 46 and improve his farm in other ways. If no surplus is available, a farmer cannot be 47 . He must either sell some of his property or 48 extra funds in the form of loans. Naturally he will try to borrow money at a low 49 of interest, but loans of this kind are not 50 obtainable.