单项选择题：下列特征中属岩浆岩中深成岩的特征是（）。 A.常具气孔构造 B.常具斑状结构 C

题型：阅读理解

Today there are 6.4 billion people on the earth. By the year 2050 there may be 12.5 billion . There are a lot of people to feed. We need more and more food.

One way to produce more food is growing stronger plants. For thousands of years, farmers have made plants better. Every season, they pick the best plants for the next season. It works very slowly. Since 1983, scientists have been able to change plants more quickly by changing their genetic（遗传的） material. Foods from plants grown in this way are called genetically modified(改变的) foods, or GM foods.

By changing the genetic material of a plant, it is possible to make new plants. They make plants which are strong against plant diseases. They can also help in our diseases; a kind of rice is being prepared , for example , which stops people becoming blind.

Rich countries produce GM foods because they are easy to grow and bring in more money. Poor countries are interested in them because they help produce more food.

GM plants are not natural. No one knows how good or bad they are,. Making GM foods is only one way of feeding people in 2050. There are strong feelings against them, because they are unnatural. They may feed people , then hurt them or their children later. But both rich and poor countries are interested in their use, and they are not going to go away. In 2050, we may think differently about them.

小题1:GM foods are made by

A. farmers B. workers C. scientists D plants

小题2:What are the good things about GM foods ?

A. They make plants strong against diseases. B. They are unnatural.

C. They can help in human diseases. D Both A and C.

小题3:GM foods .

A. are a quick way to produce food B. grow in the wild

C. are safe D are grown only in rich countries

小题4:Why do some people not like GM foods?

A. They are not useful. B. They are not helpful.

C. They are not natural. D They are not cheap.

小题5:From the passage we know that .