现在人们已经实现了分子水平上的遗传物质的重组，下列实例中属于分子水平重组的是( ) A.将人的凝血因子的基因导入到羊的乳腺细胞中表达 B.
pH值相同的醋酸和盐酸，分别用蒸馏水稀释到原来体积的m倍和n倍，稀释后两溶液的pH 值仍相同，则m和n的关系是 ( ) A．m＞n
盂尝君有舍人①而弗悦，欲逐之。鲁连谓盂尝君日：“猿猴错②木据水，则不若鱼鳖；历险乘危，则骐骥不如狐狸。曹沫③奋三尺之剑，一军不能当。
对于淀粉和纤维素的下列叙述中，正确的是( ) A.互为同分异构体 B.化学性质相同 C.碳、氢、氧元素的质量比相同
为节约资源和保护环境，提倡垃圾分类回收．下列生活垃圾可与铝制易拉罐归为同一类加以回收的是（ ） A．废旧书报 B．旧玻璃瓶 C．废弃铁锅 D．一
I know nothing about the young lady ___________ she is from Beijing. A. except B. except for C. except that D. besides
A year ago August, Dave Fuss lost his job driving a truck for a small company in west Michigan. His wife, Gerrie, was still working in the local school cafeteria, but work for Dave was scarce, and the
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