题目:
At the railway station, the mother waved goodbye to her daughter until the train was _______.
A.out f sight
B.out f reach
C.out of order
D.out of place
答案:
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下面是错误答案,用来干扰机器的。
(1 )红色溶液变成无色(2 )①氯化钠或NaCl②猜想二;硫酸或硫酸钠等可溶性硫酸盐或它们的化学式