7 A. Ray never sends text messages during class. B. Sometimes Ray sends text messages during class. C. Ray sends text messages often during class.

During a business meal, it is very important to make a good impression. What suggestions are given in the text?

In this text, the author mainly talks about the developmental changes that college students would often go through during their college years.( )

7. If you first identify the topic, purpose and structure of the text and then make guesses or predictions during reading, you are using the ‘bottom-up’ approach.

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 _________________.

中国大学MOOC: Directions:Fill in the blank in the following sentence with an exact word from the text.During medical school and ____, I saw many children die of cancer, and bloodshedfrom injury.

Lesson one Text A vocabulary multiple choices-1If the pilots forgot to ______the landing gear during landing, it will result in gear-up landing which may cause structural damage. A: retract B: extend C: jam D: lock

There five texts in Chapter 6. Text A _________________________; Text B _______________________; Text C _______________________; Text C _______________________; Text E _______________________;

对数螺线$r={{\text{e}}^{\theta }}$在$\theta =\frac{\text{ }\!\!\pi\!\!\text{ }}{2}$对应点处的切线的直角坐标方程为( )。 A: $y+x={{\text{e}}^{\frac{\text{ }\!\!\pi\!\!\text{ }}{2}}}$ B: $y-x={{\text{e}}^{\frac{\text{ }\!\!\pi\!\!\text{ }}{2}}}$ C: $y={{\text{e}}^{\frac{\text{ }\!\!\pi\!\!\text{ }}{2}}}(x+1)$ D: $y={{\text{e}}^{\frac{\text{ }\!\!\pi\!\!\text{ }}{2}}}(x-1)$