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【单选题】
PASS是新一代高效絮凝净水剂，它由X、Y、Z、W、R五种短周期元素组成，五种元素原子序数依次增大．X原子是所有原子中半径最小的，Y、R同主族，Z、W、R同周期，Y原子的最外层电子数是次外层的3倍，Z是常见的金属，其氢氧化物能溶于强碱溶液但不溶于氨水，W单质是人类将太阳能转变为电能的材料．下列说法正确的是（ ）A.
它们的原子半径依次增大
B.
WY 2 能与碱反应，但不能与任何酸反应
C.
Z与Y形成的化合物是一种耐高温材料
D.
热稳定性：X 2 R＞X 2 Y
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举一反三
【多选题】大胡子作为速卖通平台资深卖家,其想通过优化店铺结构来提升店铺的转化率,请问以下哪些举措是正确的()
A.
产品选取推陈出新
B.
划分店铺产品结构
C.
投放直通车
D.
设置钻展提高产品曝光量
【单选题】The girl enjoys reading the stories from .
A.
the Thousand an One Nights
B.
the Thousand and One Night
C.
the Thousands and One Night
D.
the Thousands and One Nights
【单选题】The author has an opinion about the Girl Scouts. Which selection from the article shows this?
A.
The Girl Scouts just came out with a new video. It stars rapper Queen Latifah.
B.
The Girl Scouts needs to change. It is facing many problems.
C.
Girl Scouts do robotics and rock climbing.They also volunteer.
D.
The Boy Scouts decided last year to let girls join. The Girl Scouts still will not allow boys.
【简答题】1) ______ A) A host of City Center Talk B) An employee at the City Center C) An ordinary person who did something great D) An amazing nurse who saved a patient’s life 2) _______ A) Because the girl wa...
【简答题】The girl spends half an hour walking to school.( 同义句改写 ) It ________ the girl half an hour to ________to school.
【单选题】A 30-kg girl steps to shore from a 60-kg boat, giving the boat an acceleration of 2 m/s2. If water resistance is neglected, the girl receives an acceleration of
A.
-4 m/s 2
B.
-15 m/s 2
C.
-1 m/s 2
D.
-8 m/s 2
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