Who can explain me:
10. Helium is not flammable and, next to hydrogen, is------
A known the lightest gas
C the lightest gas known
为什么答案是C不是A
29、是否将D(in normal)改为 in anormal?:@
Originally posted by gang_cosmo at 2005-8-10 10:08
啊 ,语法竞然错了8个?
35 Philosophy tries to discover the nature of true and knowledge and to find what is of basic value and importance in life.请问为什么选true 呀?