One way to ______ species under threat of extinction is to remove them to zoos and parks and feed them there.
A. reserve B. prevent C. preserve D. reduce
According to the statistics, listening to loud music at rock concerts ______ hearing loss in some teenagers in the past 2 decades.
A. have caused B. caused C. had caused D. has caused
__________ her son for half a month, Marcia decided to leave for Texas with the hope of finding him.
A. Not heard from B. Having not heard from
C. Not to hear from D. Not having heard from
Mrs. Obama introduced the Let’s Move _______ yesterday. Its goal is to reduce children obesity(肥胖) today and in the future.
A. challenge B. battle C. campaign D. behavior
—I think the whole class is going on a field trip next Friday.
—I’m not sure. ____________ has paid the transportation fee.
A. Not everyone B. No one C. None of them D. Neither of us
_______ in a poor family made Yuan Longping determined to solve the hunger problem in China when he was still young.
A. Bringing up B. Being brought up C. Having brought up D. Brought up
