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【单选题】In contrast to traditional analyses of minority business, the sociological analysis contends that minority business ownership is a group-level phenomenon, in that it is largely dependent upon socialgr...
A.
They were developed exclusively by Chinese immigrants.
B.
They accounted for a significant portion of the investment capital used by Chinese immigrants in blew York in the early twentieth century.
C.
Third- generation members of an immigrant group who started businesses in the 1920's would have been unlikely to rely on them.
D.
Recent immigrants still frequently turn to rotating credit associations instead of banks for investment capital.
【简答题】所谓电平信号是指信号的“0”值和“1”值的持续时间是随意的，它以（ ）的变化作为信号的变化。而脉冲信号的 “1”值仅仅维持一个固定的短暂的时刻，它以（ ）的有、无标志信号的变化。（答案请用英文逗号隔开）
【简答题】是乳糖不耐症的原因是一部分人随着年龄增长,消化道内缺乏____而不能分解和吸收____,饮用牛乳后会出现呕吐、腹胀、腹泻等不适应症。当____活性低或缺乏时,____在肠道内不分解而直接进入大肠,使大肠渗透压增高,导致水分进入肠道管腔内,大肠中细菌繁殖,产生乳酸和CO2,至pH下降,当pH<6.5时刺激大肠,引起腹痛、腹泻。
【多选题】有关乳糖不耐症,说法正确的有
A.
出现此症状的原因是，饮用乳品者体内的乳糖酶活性不足或缺乏
B.
乳糖不耐症在我国并不常见
C.
主要症状是腹胀肠鸣和腹泻
D.
乳品中的乳糖被肠道菌群利用后所产生的的气体和其他成分造成了腹胀、腹泻
【单选题】William realized that he should have felt _______ with his job, but he didn’t
A.
contented
B.
suitable
C.
comfortable
D.
interested
【多选题】vi编辑器进行多文本编辑时,打开的文件列表为f1,f2,f3,f4,f5,当前正在编辑f2文件且f2文件已经被修改,想转去f5文件进行编辑,下列哪些命令可以做到()
A.
:b5
B.
:3wnext
C.
:3next
D.
先用:w，然后再用:last
【判断题】Conten t-Based Instruction better reflects learners ’ needs for learning a second language.
A.
正确
B.
错误
【单选题】He was always _______ for knowledge, and at last became an expert in the field of art.
A.
fond
B.
content
C.
brave
D.
greedy
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