﹣﹣﹣Yuan Longping is a hero_______ is known for developing hybrid rice（杂交水稻）.
﹣﹣﹣Yes.He is a great man.（ ）
A．whichB．whomC．whatD．that
I can't hear clearly． Please ____ the radio a little．
Just one minute． I'll do it right away．（ ）
A．turn onB．turn offC．turn upD．turn down
The last Beidou GEO﹣3 ____ into space successfully on June 23，2020．
As Chinese， we feel proud of it．（ ）
A．sendsB．sentC．is sentD．was sent
I called you yesterday afternoon， but you didn't pick up．
Sorry． I ____ an online class at that time．（ ）
A．takeB．tookC．is takingD．was taking
Is Li Mei a teacher？
Yes， she is． She ____ at a village school．（ ）
A．teachesB．is teaching
C．taughtD．will teach
Super brain is a hit TV show recently． Which competitor do you like best？
I think Zhao Jinhao is one of ____ _competitors among them．（ ）
A．smartB．smarter
C．smartestD．the smartest