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他离开帐篷, 开始走入森林。 He ________ the tent and ________ ________ ________ into the forest.
1年前
After John had been in London for three years, he and his wife had a lot to tell ________.
1年前
气候影响人类的生产活动.但是,植树造林会改善局部地区气候,这说明______.
1年前
在Cl2,HClO,KClO3,HCl,HClO4,NaCl,Cl2O7中,氯元素的化合价有( )种.
1年前
join meeting 还是 join the meeting
1年前