从理论上讲，（）是中央银行调整货币供给量的最简单的办法。
A．公开市场业务
B．变动法定存款准备金率
C．调整再贴现率
D．调节利率
参考答案：B
We have made up our minds that we’ll go to Wales for our summer vacation, but we still have not ___________________ when we’re going.
A．organized
B．expressed
C．settled
D．performed
肺爆震伤属胸部（）
A.减速伤
B.加速伤
C.枪弹伤
D.闭合性损伤
E.开放性损伤
