He is _____________ than his mother.[ ]
A. heavier
B. more heavy
C. heavy
D. heaviest
答案:A
某化合物X在空气中完全燃烧,反应的化学方程式是
A.CH4O
B.C2H6
C.C2H6O
D.C2H4
行至两座山谷之间,如果遇到较强的横风,感觉车辆产生横向偏移时,要急转转向盘拨正行进方向。