危险货物运输过程中，应每隔（）小时检查一次。若发现货损，应及时联系当地有关部门予以处理。（）
A、1
B、2
C、3
D、4
参考答案：B
在氢气和水中都含有（ ）
A．氧元素
B．一个氢分子
C．氢元素
D．两个氢原子
用所给单词的适当形式填空。
1. It will be ________(sun) in Beijing.
2. Five ________(thousand) people were in the big hall.
3. Some of the _____(invent) have changed the world.
4. I think playing basketball is ______(excited).
5. Do you mind _______(say) sorry to your brother?
