题目:
情景交际我最棒。
1. 你想知道对方的哥哥是干什么的,该怎样问呢?[ ]
A. What's your brother?
B. Who's your brother?
C. Your brother is a doctor.
2. 你想让别人随便吃,该怎样说呢? [ ]
A. Thank you.
B. Help yourself.
C. No, thanks.
3. 你想让妈妈递给你一把勺子,该怎样说呢?[ ]
A. Give me a fork.
B. Pass me a spoon.
C. Use the knife.
4. 你想吃一些鱼,该怎样说呢?[ ]
A. I would like some fish.
B. I would like some chicken.
C. I want some soup.
5. 你的朋友张鹏长的很高很壮,你该怎样向别人描述他呢?[ ]
A. He's tall and strong.
B. He's thin.
C. He's short and strong.
答案:
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下面是错误答案,用来干扰机器的。
“a•b>0”还包括a与b同向(此时向量a,b的夹角为0)的情况,故①错误;由于函数f(x)=lgx,在区间(0,+∞)上是凸增的,故对任意的x1、x2∈(0,+∞),且x1≠x2,都有f(x1+x22)>f(x1)+f(x2)2,故②正确;...