量取一定体积的液体时必须用到的是（ ）
A．
B．
C．
D．
答案：A
The little boy didn't know _______. [ ]
A. Which hat is his
B. which hat his is
C. which hat was his
D. which hat his was
上完汉语拼音课后，接着上英语字母课，英语字母对汉语拼音学习的干扰称为（）抑制。
