Let's _____ inside the window. [ ]
A. look
B. looks
C. looked
答案：A
— Could you give me some on how to learn English ?
— Sure. Practice makes perfect.
A．advice; good
B．suggestions; good
C．advice; well
D．suggestion; well
沃克环流是指正常情况下发生在赤道附近太平洋洋面上的一种热力环流。若某些年份赤道太平洋东部（秘鲁附近）海水大范围持续异常变冷，海水表层温度低出气温平均值0.5℃以上，则称为“拉尼娜”现象。读下面“沃克环流示意图”，回答下列小题。
在沃克环流中（）
A．甲地为高压
B．乙地为低压
C．水平气流由乙吹向甲
D．甲地垂直方向气流下沉
