自2010年至今的四级考试中， 共出现过 次
自2010年至今的六级考试中， 共出现过 次
N-VAR 挑战;难题 A challenge is something new and difficult which requires great effort and determination.
I like a big challenge and they don't come much bigger than this...
The new government's first challenge is the economy.
PHRASE (成功地)应对挑战，迎接挑战 If someone rises to the challenge, they act in response to a difficult situation which is new to them and are successful.
The new Germany must rise to the challenge of its enhanced responsibilities...
They rose to the challenge of entertaining 80 schoolchildren for an afternoon.
N-VAR (对真实性、价值、权威等提出的)怀疑，质疑 A challenge to something is a questioning of its truth or value. A challenge to someone is a questioning of their authority.
The demonstrators have now made a direct challenge to the authority of the government.
VERB 怀疑，质疑(真实性、价值、权威等) If you challenge ideas or people, you question their truth, value, or authority.
Democratic leaders have challenged the president to sign the bill...
The move was immediately challenged by two of the republics...
VERB 挑战；向…下战书 If you challenge someone, you invite them to fight or compete with you in some way.
A mum slashed a neighbour's car tyre and challenged her to a fight after their daughters fell out...
He left a note at the scene of the crime, challenging detectives to catch him...
VERB (警卫)盘问，查问 If someone is challenged by a guard, they are ordered to stop and say who they are or why they are there.
The men apparently opened fire after they were challenged by a patrol.