下列说法中正确的是……（ ）

      A、镁的原子质量就是镁的相对原子质量

      B、一个氧原子的实际质量约等于16/6.02×10²³ g

      C、水的相对分子质量等于18g

      D、二氧化硫的摩尔质量是64g

—— Do you mind my opening the window? It’s a bit hot in here. 

    —— ______ , as a matter of fact

A. Go ahead      B. Yes, my pleasure

C. Yes, I do      D. Come on

What I need is_____ book that contains ______ABC of oil painting. 

A. a; 涓嶅～        B. the; 涓嶅～     C. the; an     D. a ; the

下列文字表述与反应方程式对应且正确的是（   ）

A．溴乙烷中滴入AgNO₃溶液检验其中的溴元素：Br^-+Ag⁺==AgBr↓

B．用醋酸除去水垢：CaCO₃ + 2H⁺==Ca²⁺ + H₂O + CO₂↑

C．利用腐蚀法制作印刷线路板：Fe³⁺ + Cu == Fe²⁺ + Cu²⁺

D．实验室用液溴和苯在催化剂作用下制溴苯：

It is often ______ that human beings are naturally equipped to speak.

A. said       B. to say     C. saying     D. being said

Charles was alone at home, with_______ looking after him.

A. someone   B. anyone     C. not one   D. no one

My friend showed me round the town, ______ was very kind of him.

A. which         B. that         C. where        D. it

The children loved their day trip, and they enjoyed the horse ride ______.

A. most       B. more     C. less         D. little

—— Do you mind my opening the window? It’s a bit hot in here. 

    —— ______ , as a matter of fact

A. Go ahead      B. Yes, my pleasure

C. Yes, I do      D. Come on

下列词语中加点字的读音，完全相同的一组是

A．划桨    划算    划价    划一不二    B．着装    着眼    着落    着手成春

C．抹杀    抹黑    抹粉    转弯抹角    D．妥帖    请帖    字帖    服服帖帖