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【单选题】
已知等差数列{a n }中，a 2 +a 4 =8，a 1 =2，则a 5 的值是（ ）A.
6
B.
5
C.
4
D.
3
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反馈参考答案：
举一反三
【判断题】Today, a quarter of the Welsh still speak Welsh as their first language. _________A. √ B. ×
A.
正确
B.
错误
【单选题】At the time of the 1991. if the Welsh is 10 million, how many welsh population could speak Welsh?
A.
10 million.
B.
1 million
C.
2 million.
D.
0.2 million.
【判断题】7 Today, a quarter of the Welsh still speak Welsh as their first language. _________
A.
正确
B.
错误
【单选题】Today about______of the Welsh population still speak Welsh as their first language and about one percent speak only Welsh.
A.
half
B.
two thirds
C.
one fifth
D.
a quarter
【判断题】Today, a quarter of the Welsh still speak Welsh as their first language. _________
A.
正确
B.
错误
【判断题】Today, a quarter of the Welsh still speak Welsh as their first language. _________
A.
正确
B.
错误
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