4.To pick up the telephone anytime is one kind of good etiquette of business meeting.

4.To give your email a thorough proofreading can help you catch a lot of spelling and grammar mistakes.

1.A teacher with ten students(have)____come. •2.I.aswell as them,(be)______ready help you •3.The work (be)----import. •4.To learn English well(be)---- not easy. •5.What he said (be)----important •6.The people living in the countryside(be)------very kind. •7.TheUnited states (found)----in 1776 8.The Arabian Nights (be)_____very interested

Choose the right safety equipment for different occupations. a.strong boots b.a hard hatc.protectivesuit d.a special vest with reflective material e. earplugsf. eyewear g.vinyl gloves 1.To civil engineers, (1)________ isthe mustand they alsohas to wear (2)_______when working at night. 2.Radiologistsshould alwaysworkunder time limitwearing (3)________to avoid contact with harmful radiation for long 3.Electrical engineers have to work in a clean roomprotective suit together with eyewear and (4)_______ so as not to make damage to the delicate Led components. 4.To production engineers,(5)______is essentialat work together with (6)_______ to protect their hearing.

在所给的算式中，填上+、-、×、÷和（ ），使得下面算式成立。（1）4 4 4 4＝1（2）4 4 4 4＝1（3）4 4 4 4＝2（4）4 4 4 4＝3[8分]

数列-4, 4, -4, 4, -4…….

表达式4^4\4*4*4/4 Mod 4的值是

【多选题】在下面 4 个 4 中间填上适当的运算符号和小括号使算式成立。 4 4 4 4=2 A. 4÷ 4 +4÷ 4=2 B. 4× 4÷ （ 4+ 4 ） =2 C. 4+ 4 +4 ×4=2 D. 4- （ 4 +4 ） ÷4=2 答

单音听辨。十个音为一组，含有变化音升4 [音频]/module/audioplay.html?objectid=525dda751efa2c644ef98798529599a7: *4 | 7 |升4 |-5 | 4 | 升4 |*4 | 4 |1 |*4 ||*4 | 7 |升4 |-5 | 4 | 升4 |*4 | 4 |2 |*4 ||*4 | 7 |升4 |-5 | 4 | 升4 |*4 | 6 |2 |*4 |

下列哪个是《圆舞曲》的乐段结构？ A: a(4）+b(4)+a(4)+c(4) B: a(4）+b(4)+a(4)a1(4) C: a(4）+b(4)+a1(4)+c(4)