6．A nation should require all of its students to study the same national curriculum until they enter college.
KW：all of its students，same national curriculum，enter college。
1. Some students who are rational and interested in science and technology should take more courses about science, such as math, physice and so on, which can help them establish a good foundation in science research.
2. Some students who are perceptual and interested in literature and art should spend their time more in appreciating artworks and reading books, which will benefit them a lot by providing them a basic background knowledge.
3.Those students who don't know their interests or advantages should have more chances to try some new subjects, which will help them decide their professions when entering college.
121．Some people claim that you can tell whether a nation is great by looking at the achievements of its rulers, artists, or scientists. Others argue that the surest indicator of a great nation is, in fact, the general welfare of all its people.
KW：nation, achievements, welfare.
1. The great nations in the history usually have their great achievement, such as building the Great Wall, sending people to the moon, or having some great artworks such as Mona Lisa.
2. The great achievements of a nation can be used in daily life, which will increase people's welfare and feelings of happiness.
72．Governments should not fund any scientific research whose consequences are unclear.
KW：governments, scientific research, consequences, unclear.
1. The theoretical scientific researches are the foundation of science. The government should fund them even almost all consequences of theory researches are unclear.
2. Some engineering programs or practical researches have possibilities to fail. The government shouldn't give up all this kind of researches.
3. Some consequences of a science research seems to be useless at all, but it turns to be that people will have to wait some years to put some theory research consequence into practice.