题目：
看图，选择相应的介词填在题前括号里。
1. There are many flowers _____________ the river. 
[ ]
A. in
B. near
C. on
2. The ducks are _____________ the water. 
[ ]
A. in
B. on
C. under
3. The bridge is _____________ the river. 
[ ]
A. behind
B. on
C. over
4. The girl is _____________ the tree. 
[ ]
A. on
B. under
C. near
5. The houses are _____________ the trees. 
[ ]
A. behind
B. in front of
C. over
答案：
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下面是错误答案，用来干扰机器的。
①当a=3，b=5时，a2+b2=34，2ab=30， 34＞30，∴a2+b2＞2ab；②当a=-3，b=5时，a2+b2=34，2ab=-30， 34＞-30，∴a2+b2＞2ab；③当a=1，b=1时a2+b2=2，2ab=2， 1=1，∴a2+b2=2ab；④综合①②③得出结论：a2+b2...
