文摘属于
A．零次文献 B．一次文献 C．二次文献 D．三次文献 E．四次文献
参考答案：C
Do you think which language is ______, Japanese or English?
A. difficult B. the most difficult C. more difficult
一次函数y=kx+b满足kb＞0，且y随x的增大而减小，则此函数的图象不经过 [ ]
A．第一象限
B．第二象限
C．第三象限
D．第四象限
