小题1:C
小题1:D
小题1:A
小题1:C
小题1:B
1. C 根据Since 1983, scientists have been able to change plants more quickly by changing their genetic（遗传的） material可知是由科学家制造出来的，选C。
2. D 此题讲的是这些遗传基因 改变的食物的优点，定位到第三段。从 They make plants which are strong against plant diseases. They can also help in our diseases可知A和C都是其中的一个方面，故选D。
3. A 细节题的考查。从because they help produce more food可知它们能够帮助产生更多的食物，故是一种快速生产食物的途径，故选A。
4. C 本题问的是人们不喜欢的原因，从There are strong feelings against them, because they are unnatural人们强烈反对是因为它们不是自然的，故选C。
5. B 此题是推测类型的题。根据文章倒数第二句But both rich and poor countries are interested in their use, and they are not going to可知它们不会消失（go away），相当于disapper,故选B。