简答题
A) It damages not only our bodies, but also our brains.
B) The virus has infected more than 145 million people worldwide.
C) A scientist at the University of California has established what this virus does in the brain.
D) Many basic questions remain unanswered about the virus.

简答题
A) Social media posts.
B) Email updates.
C) Long face-to-face talk with the customers.
D) Long text chains.

简答题
A) Only private university institutions start to offer free or almost free full courses.
B) Other universities offering open education are prestigious all private universities.
C) Some notable public universities including Tsinghua, Peking, Edinburgh offer open education.
D) All of the above.

简答题
A) A woman with brain injury communicated for the first time in 21 years.
B) A woman suffered from a car accident on Christmas.
C) A woman suffered a brain injury 21 years ago.
D) A woman was severely disabled since she was 15.

简答题
A) Because people are too lazy to do exercise.
B) Because people rely more on modern technology than on themselves.
C) Because people usually give up formal exercise.
D) Because people are too busy with their work and family.

简答题
A) Teaching in-person.
B) Teaching from home.
C) Her medical condition.
D) Chicago Teachers Union's vote.

简答题
A) Verbal communication is the earliest form of human communication.
B) Verbal communication was bound to one specific area only.
C) Verbal communication had been replaced by online chatting.
D) Verbal communication includes song, poems and chants.

简答题
A) The necessity of teeth brushing.
B) A toothpaste that may help treat peanut allergy.
C) A New York City-based company.
D) The symptoms of peanut allergy.