水中溶解的气体主要以()状态存在。
A、阳离子
B、分子
C、阴离子
D、原子
参考答案:B
根据汉语提示或句意,写出句中所缺单词。
1. Her uncle often reads _________ (报纸).
2. On my birthday, I'm very happy b_________ I get lots of presents.
3. We usually do morning e__________ every morning.
4. _________ is the fourth day of a week.
5. My car is________(not the same) from hers.
围堰拆除一般应选择在洪水季节或洪水时段进行。