A:④⑤⑧
B:③④⑤⑧
C:④⑤⑦⑧
D:③④⑤⑦⑧
Parents should pay attention to the cases _______ their children have difficulty adapting to new surroundings.
把下列有理式中,是分式的代号填在横线上____.
①﹣3x;② xy ;③ 23x2y−7xy2 ;④﹣ 18x ;⑤ 5y+3 ;⑥ x2−1x−1 ;⑦﹣ m2−1π ;⑧ 3m+20.5 .
We study Chinese, English and some _______ subjects.