_______ Chinese are learning English now_爱下问搜题

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问题选择题

_______ Chinese are learning English now.

[ ]

A. Much and much

B. More and more

C. Many and many

D. Much and more

答案

答案：B

选择题

科学家最近研制出可望成为高效火箭推进剂的N(NO₂)₃（如下图所示）。已知该分子中N-N-N键角都是108.1°，下列有关N(NO₂)₃的说法正确的是

A.分子中N、O间形成的共价键是非极性键

B.分子中四个氮原子共平面

C.该物质既有氧化性又有还原性

D.15.2g该物资含有6.02×10²²个原子

单项选择题

A long blast to warn the vessels（）vicinity.

A.in

B.on

C.at

D.for