计算机硬件无法直接识别并执行的语言是( )。
A．高级语言
B．算法语言
C．机器语言
D．符号语言
参考答案：A,B,D
解析： 机器语言能被计算机硬件直接识别并执行，它是直接用二进制代码指令表达的计算机语言，指令是用0和1组成的一串代码，它们有一定的位数，并分成若干段，各段的编码表示不同的含义。故排除C项。其他三项均无法被计算机硬件直接识别并执行。
| 完形填空. | |||
| Swimming is very popular. People like 1 in summer because water makes people feel 2 . If you like swimming but swim in a wrong place, it may be 3 . These years, a lot of people 4 when they were 5 themselves in the water, and most of them were students. Some people are not 6 in swimming. They often think they swim so well that 7 will happen to them in the water. Summer is here again. If you 8 swimming this summer, don't get into water when you are 9 . If there is a "No Swimming "sign, still don't get into water. If you remember these, swimming 10 safe. Swimming is good for your health. | |||
| ( )1.A.boating ( )2.A.hot ( )3.A.dangerous ( )4.A.dying ( )5.A.enjoying ( )6.A.careless ( )7.A.nothing ( )8.A.will go ( )9.A.alone ( )10.A.is | B.running B.cool B.happy B.died B.enjoyed B.care B.anything B.go B.lonely B.be | C.swimming C.cold C.safe C.dead C.helping C.careful C.everything C.goes C.safe C.will be | D.skating D.warm D.danger D.death D.helped D.carefully D.something D.went D.danger D.will |