【单选题】The boy has been going back home later _____, which worries his parents. [ ]
【单选题】It was an _______ day today, so he got up much earlier than _______. [ ]
【简答题】周期表中,处于斜线位置的 B 与 Si 、 Be 与 、 Li 与 性质十分相似,人们习惯上把这种现象称之为 “ 斜线规则 ” 或 “ 对角线规则 ” 。
【简答题】周期表中处于斜线位置的 B 与 Si 、 、 性质十分相似,把这种现象称对角线规则 。
【单选题】There were fewer people in the shop than usual. There were ______.
【简答题】周期表中,处于斜线位置的B与Si、______、______性质十分相似,人们习惯上把这种现象称之为“斜线规则”或“对角线规则”。
【简答题】Where is snow usual in winter?
【简答题】How long is there the usual guarantee?