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【单选题】
短周期元素W、X、Y、Z的原子序数依次增大，其中W的阴离子的核外电子数与X、Y、Z原子的核外内层电子数相同．X的一种核素在考古时常用来鉴定一些文物的年代，工业上采用液态空气分馏方法来生产Y的单质，而Z不能形成双原子分子．根据以上叙述，下列说法中正确的是（ ）A.
上述四种元素的原子半径大小为W＜X＜Y＜Z
B.
W、X、Y、Z原子的核外最外层电子数的总和为20
C.
W与Y可形成既含极性共价键又含非极性共价键的化合物
D.
由W与X组成的化合物的沸点总低于由W与Y组成的化合物的沸点
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举一反三
【单选题】Why was Septimus frightened after he saw the person in the dark room?
A.
because the person was the principal of the school.
B.
because the person was a monster-like one.
C.
because Septimus was found by the person.
D.
because the person was invisible.
【简答题】Listen to an interview about tips for freshman students and do the following exercise. Match the name of the person in the left column with the tip given by the person in the right column.
【简答题】background表示
【单选题】The person in the poem (诗) watches the moon ______.
A.
on a beautiful night
B.
on a cloudy night
C.
in the day time
【单选题】The person in the poem ______.
A.
wants to see the moon very much
B.
does not want to see the moon
C.
wants to see the sun very much
【简答题】标记的属性中border表示设置表格的______,align表示设置表格在网页中的______对齐方式,bgcolor表示设置表格的________,background表示设置表格的_______。
【简答题】蛋白质组(答案含有标点符号)
【简答题】蛋白质组学(答案含有标点符号)
【单选题】The passage states that before the blue square appeared, the person in the video ______.
A.
was in a relaxed state
B.
watched the screen closely
C.
wondered what would happen
D.
got ready to respond to a shock
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