第4题: [单项选择]He left school after taking six C-levels because ______. A. he was afraid that the market might disappear B. he did not enjoy school at all C. he wanted to work on computers D. he wanted to become a millionaire and retire early 参考答案:C 答案解析:解析:从文章第三段“Brendan got his job four months ago,... and working for a time in a computer shop”及“I got
第12题: [单项选择]细胞质的染色与pH的关系错误的是() A. pH调到蛋白质等电点4.7~5.0时,酸性染料不易染色 B. pH调到蛋白质等电点4.7~5.0时,碱性染料不易染色 C. pH调到蛋白质等电点6.7~6.8时,胞质易染色 D. pH调到蛋白质等电点6.7~6.8时,胞核易染色 E. pH调到蛋白质等电点6.7~6.8时,胞核不易染色 参考答案:E