女性，30岁，颈部包块1个月，生长快，无痛。查体见甲状腺右叶一直径3cm大小包

More and more people in Beijing are able to talk and write        English these days.[ ]

A. on

B. in

C. to

D. at

News reports say peace talks between the two countries ______ with no agreement reached. [ ]

A. have broken up

B. have broken down

C. have broken out

D. have broken in

图中下列工具：①钢丝钳②瓶盖起子③理发剪刀④镊子。其中属于省力杠杆的是：

A.①③

B.③④

C.②③

D.①②

会议 * * 台上的座位可以采取（）的方式安排。

A.以职务高低为序

B.社会知名度为序

C.以选举票数多少为序

D.以英语字母的顺序排列

下渣过铁的原因有哪些？