问题 选择题

硅藻土的化学成分主要是SiO2,含有少量的Al2O3、Fe2O3等和有机质。硅藻土是

A.氧化物

B.单质

C.化合物

D.混合物

答案

答案:D

题目分析:因为硅藻土的化学成分主要是SiO2,含有少量的Al2O3、Fe2O3等和有机质,说明有多种物质组成,顾属于混合物,答案选择D.

写作题

书面表达。

     国内某家英文报社设有一个求助信箱。请根据一份学生现状调查中列出的信息,以初三学生王磊

的名义给报社写一封80词左右的英文信。

     信的开头和结尾均以给出。 

                                 

参考词汇:过重的负担 overload;   压力 pressure;   期望 expectation

Dear Dr. Helper,

     I am a Junior student. I am now in great need of your help                                                   

                                                                                                                                           

                                                                                                                                           

                                                                                                                                           

I write this letter only to wish I could have someone to talk to. I'm looking forward to your advice.

                                                                                                                       Your sincerely,

                                                                                                                       Wang Lei

单项选择题