—Mrs Zhang was sent to teach English in a poor mountain village last year.
—She said she would never forget some pleasant ___________ while working there.
A：experiments
B：expressions
C：experiences
D：emotions
比大小．(填算式)
17－7
16－3
12＋5
19－8
11＋8
____＜____＜____＜____＜____
关于现代人的发源地，主要有（ ）
①多地区起源说 ②欧洲说 ③非洲说 ④美洲说 ⑤亚洲说 ⑥单一地区起源说
