There are all kinds of machines. They 1 in many different ways. One kind of machine is called a computer. A computer can do many things. A computer can do math problems. People can also do math problems. But they cannot do it 2 a computer.
    Computers remember things. Computers do 3 people tell them. People cannot remember as many things as computers. Computers help tell 4 the weather will 5.Computers help fly rockets and spaceships.
    These are 6 of ways computers are used. They are used in7 ways. Some computers do just 8 things. Some computers can do a lot of things. There are 9 computers. There are big computers. There may be computers in your school. Do you 10 what they do?

某外商计划在4个候选城市中投资3个不同的项目，且在同一个城市投资的项目不超过2个，则该外商不同的投资方案有  (　　)

用配方法解方程x²﹣6x+4=0，下列配方正确的是（　　）

所谓书卷气，是一种饱读诗书后形成的        气质。书卷气来自读书，在幽幽书香的熏陶之下，浊俗可以变为清雅，奢华可以变为       ，促狭可以变为开阔，偏激可以变为        。捧起书来吧，你会发现里面的风景美不胜收！