A、 challenged
B、 required
C、 designed
D、 struck
答案:C
A、 challenged
B、 required
C、 designed
D、 struck
答案:C
A. effects
B. habitats
C. infections
D. hardships
A. compounds
B. distractions
C. conventions
D. instruments
A. challenged
B. required
C. designed
D. struck
A. feasible
B. fragile
C. frequent
D. fearful
A. potential
B. excessive
C. financial
D. effective
A. broaden
B. encounter
C. interfere
D. dismiss
A. decorating
B. remaining
C. promoting
D. fluctuating
A. took out
B. carried out
C. gave out
D. put out
A. establish
B. benefit
C. shrink
D. account
A. infectious
B. previous
C. curious
D. religious