系统性红斑狼疮病人皮肤护理哪项不妥( ) A．常用清水清洗 B．忌用碱性肥皂

棉蚜体型微小，能附着于棉花植株上生活繁殖，以吸收棉花汁液为食。为了对棉蚜虫害进行监测，科研小组从某年6月10日开始对某棉田棉蚜种群数量进行调查，调查结果如下表：

若长期使用农药防治棉蚜，会导致棉蚜种群的抗药基因频率______(增大、不变、减少)。

下列词语没有错别字的一项[ ]

A．渣滓中流砥柱敷衍海角天涯

B．鞭笞相形见拙捶炼明辩是非

C．妨碍世外桃园遭殃民生凋弊

D．赡养斧底抽薪气慨直言不诲

补全句子。（共5小题；每小题1分，计5分）

请根据上下文的意思，用括号内所给单词的恰当形式补全短文。每个空格只准填一个单词。

My mother is very nice. She is a 小题1:      （work） in a clothes store. She usually gets up at 6：30. Then she cooks breakfast for me. After小题2:_____         （have） a bowl of porridge and some broccoli，she goes to work at 7：30. There 小题3:         （be）usually many people in her clothes store. So she is very busy.

My mother’s work in the morning is over at 11：45，and                                                                       starts again at 1：30 in the afternoon. So she has to have lunch in the store. Her work in the afternoon  小题4:         (end) at 5：30，and she goes home at 6：30. Then she has dinner with 小题5:         (we）at home. After dinner we watch TV together.

转氨酶的辅酶中含有的维生素是（）

A.维生素B₆

B.维生素B₁

C.维生素B₁₂

D.维生素B₂

E.维生素C

引入圆的参数方程是因为圆的直角方程难以解决在某一个时刻运动支点的位置问题。