In this text, the sign by his Chinese friends refers to ( ).

In this text, the sign by his Chinese friends refers to ( ). A: Traffic signals B: Zodiac sign C: cultural model of people D: one's birthday

What can we learn from the story of Text A? . A: we don’t really know others by the Internet B: people are fond (喜欢) of making friends online C: computers are more helpful than telephones D: chat box is very important in making friends

This text presents the differences in the author's communication styles with his male and female friends and discusses the underlying reasons such differences: Men and women have very different emotional and rational processes. （ ）

Why are friends so important in our life according to the text? A: Because loneliness is a mental health issue. B: Because people are social animals. C: Because if a person didn’t have a good friend, his or her life would be fundamentally lacking. D: Friends can help us at any time.

It is easy( ). A: to make friends B: make friends C: making friends

We have all kinds of friends,______school friends, work friends,or sports friends.

函数$f(x)=x+\sin x$的( )。 A: 上凸区间为$(2n\text{ }\!\!\pi\!\!\text{ },(2n+1)\text{ }\!\!\pi\!\!\text{ })$,下凸区间为$((2n-1)\text{ }\!\!\pi\!\!\text{ },2n\text{ }\!\!\pi\!\!\text{ })$ B: 上凸区间为$((2n-1)\text{ }\!\!\pi\!\!\text{ },2n\text{ }\!\!\pi\!\!\text{ })$,下凸区间为$(2n\text{ }\!\!\pi\!\!\text{ },(2n+1)\text{ }\!\!\pi\!\!\text{ })$ C: 上凸区间为$(n\text{ }\!\!\pi\!\!\text{ },(n+1)\text{ }\!\!\pi\!\!\text{ })$,下凸区间为$((n-1)\text{ }\!\!\pi\!\!\text{ },n\text{ }\!\!\pi\!\!\text{ })$ D: 上凸区间为$((n-1)\text{ }\!\!\pi\!\!\text{ },n\text{ }\!\!\pi\!\!\text{ })$,下凸区间为$(n\text{ }\!\!\pi\!\!\text{ },(n+1)\text{ }\!\!\pi\!\!\text{ })$

There are _____ texts. They are Text A _________________, Text B _________________, Text C _________________, Text D _________________.

When I _____ into a friend or watch a show with friends, I am extremely happy. A: vent B: intimidating C: scared D: text E: get caught up in F: bump G: immerse H: poke I: random