搜题请搜索小程序“爱下问搜题”
问题 选择题
_____ she couldn't understand was _____ fewer and fewer students showed interest in her lessons.

A. What; why
B. That; what
C. What; because
D. Why; that
答案

答案：A

选择题
设S(n)=
1
n
+
1
n+1
+
1
n+2
+
1
n+3
+…+
1
n2
，则（　　）
A．S(2)=
1
2
+
1
3
B．S(2)=
1
2
+
1
4
C．S(2)=1+
1
2
+
1
3
+
1
4
D．S(2)=
1
2
+
1
3
+
1
4
查看答案
多项选择题

发现剧毒化学品（）等，必须立即向当地公安部门报告。

A.被盗

B.丢失

C.流散

D.泄露

E.生产不规范
查看答案