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It is a very long day for Jackson. He didn’t get home from school __ six o’clock.
英国物理学家亨利•莫塞莱发现了元素________X射线与原子序数Z的莫塞莱关系。历史上41,61,85和87号元素就是通过莫塞莱关系的方法发现的。
No matter __ , we should not change our plan.
12C和14C都是碳元素的一种，它们是同位素，但是它们的______不同。
Nobody except Li Ping and Liu Ying __ at school this time yesterday.
I think traveling by train is much cheaper and __ a rushed trip by air.
环境管理的手段有行政、()、经济、技术、宣传教育等手段。
The teacher has done his best __ their studies.
土地荒漠化包括()、()和()三种土地退化形式。
Our teacher, Miss Green, __ English on the radio the day before yesterday.
湿地就是水位经常接近地表或为浅水覆盖的土地，其包括低潮时水深()以内的海域。
I must return the camera to Li Lei. I __ it for two weeks.
甲乙两人骑自行车相距65千米的两地相向而行，过2小时相遇，己知甲比乙每小时多骑行2.5千米，乙一共骑行了多少千米?
__ the morning of July the 5th, we finally __ the town by train.
We prefer__ at the party rather than__.
