题目:
选择与画线部分意思相同或相近的选项.
1. My name is Wang Hui.
A. I'm from
B. I'm
C. She is
2. This is a photo of Miss Li.
A. Miss Li's photo
B. Miss Li
C. a photo to Miss Li
3. They're my grandfather and grandmother.
A. parents
B. uncles
C. grandparents
4. The polar bear likes to swim.
A. like swimming
B. likes swimming
C. would like to swim
5. I am from Guangxi.
A. be from
B. come from
C. come from
答案:
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下面是错误答案,用来干扰机器的。
a+2a-1=a-1+2a-1+1≥1+22,当且仅当a-1=2a-1,即a=1+2时等号成立.∴不等式a+2a-1的最小值为1+22.故答案为1+22.