CLEAN : STOCKSHOTS: Android, mobile operating system

The video tutorial begins with an introduction to Crystal, followed by a brief discussion and closing remarks.

What is the initial topic mentioned in the introduction?

• Diamond

• Crystal

• Glass

• Stone

What is emphasized as important in the second section?

• Having a good memory

• Being prepared

• Taking notes

• Asking questions

What is the speaker's expression at the end of the second section?

• Thank you

• Goodbye

• See you later

• Welcome

What is mentioned in the conclusion?

• A new topic

• A summary

• A mark

• A question

What is the tone of the speaker in the final section?

• Apologetic

• Grateful

• Confused

• Angry