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【单选题】
某氧化物X难溶于水，能与烧碱反应，生成易溶于水的化合物Y，将少量Y溶液滴入盐酸中能生白色的胶状沉淀，则X是A.
B.
C.
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【简答题】People all over the world celebrate the new year. However, not al countries celebrate in the same way, in some countries, the new year doesn't begin on 1 date very year. In many countries, the new yea...
【单选题】It's pay-day, and they're waiting _________ .
A.
to be paid
B.
to have paid
C.
to be paying
D.
for paying
【单选题】They're waiting for Mark _____.
A.
during the interval of the performance
B.
to meet them before the play begins
C.
to join them after the performance
D.
a few days after they've seen the play
【单选题】3 They're waiting for Mark _______.
A.
to meet them before the play begins
B.
during the interval of the play
C.
to join them after the performance
D.
a few days after they've seen the play
【简答题】A: So,what ( ) they doing to fix your car?B: Nothing! They're waiting for some parts to come in.
【多选题】习总书记明确提出中国科技创新突出特点:( )
A.
我国发展必然是一个工业化、信息化、城镇化、农业现代化叠加发展的“并联式”的过程，必须充分发挥科技进步和创新的关键作用。
B.
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C.
我国科技事业取得举世瞩目成就的最重要经验之一就是充分发挥社会主义制度优越性，集中力量办大事，抓重大、抓尖端、抓基本。
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