初期复苏的首要关键是()
A．口对口人工呼吸
B．保持呼吸道通畅
C．心脏按压
D．电除颤
E．开放静脉
参考答案：B
童年时，我们经常唱起一首儿歌“小燕子，穿花衣，年年春天来这里……”春天燕子从南方飞到我们这里来，主要是受哪种非生物因素的影响。[ ]
A．阳光
B．水分
C．温度
D．空气
—Many people in England love to give advice on weather reporting.
—Yes, but I think the weather office’s computers _____ be more accurate.
A．can
B．must
C．ought to
D．might
—Many people in England love to give advice on weather reporting.