下列变化属于物理变化的是（ ）
A．乙烯通入酸性高锰酸钾溶液褪色
B．浓硝酸滴到皮肤变黄
C．钠与酒精混合有气泡
D．苯滴入溴水中振荡后水层接近无色
答案：D
根据句意和汉语注释，在答题卡标有题号的横线上，写出单词的正确形式。
小题1:I’m so helpful that it's my ______ (please) to help give a seat to somebody in need.
小题2:The final-exam is coming. The students are ______ (active) revising for tests.
小题3:Because many factories pour waste water into the river, we must take action to change the______ (pollute) environment.
小题4:It’s known to all that this trail is the ______ (far) one we have ever walked.
10个月男婴，近1周来抽搐3次。体检：智力发育落后，表情呆滞，皮肤白嫩，头发黄褐色。尿有鼠尿臭味。脑电图检查发现异常，尿三氯化铁试验阳性。其诊断为( )
A．癫痫B．呆小病C．先天愚型D．黏多糖病E．苯丙酮尿症
