My uncle ______ the club in 2014. He ______the club for over 3 years.
A：joined; has been a member of
B：joined; has joined
C：has joined; has joined
D：has joined; has been in
我们班一半的同学骑车上学。
____the students in our class ride to school．
.如图所示，是本月份的日历表，任意圈出一横行或一竖列相邻的三个数，这三个数的和不可能是（ ）
日
一
二
三
四
五
六
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
楚王只好嘱托大开城门，接见晏子。
病因：____
处方：____
影响唾液淀粉酶发挥作用的主要原因是（ ）
