TOKYO(AP)-An express train traveling through strong winter winds derailed(出轨)in northern Japan，killing four people and injuring more than 30，officials said Monday.

　　Five cars of the six-car express train derailed Sunday evening，three of them toppling(倾倒)onto their sides in Yamagata prefecture(辖区)，about 1 80 miles north of Tokyo，officials said.The train was going from northern Akita to Niigata prefecture.

　　The injuries of the survivors did not appear to be life-threatening，Yamagata police spokesman Yoshikatsu Oe said.It was unclear how many passengers were on the train，but Oe said most of the injured were in the first two cars.

　　The dead included two men and two women, and rescuers planned to lift the wreckage(残骸)later in the day to see if any other passengers remained beneath，officials said.

　　Transport Ministry official Hiromi Mishima said it was not known what caused the derailment and officials were assessing the extent(程度)of the damage.Railway operator JR East Co.President Mutsutake Otsuka apologized for the accident at a news conference Monday morning and promised a thorough investigation(调查).

　　Yamagata police official Yasuhiro Sugiu said there had been high.speed wind warnings for the area.According to a train conductor，a strong gust(阵风)hit the train just before the accident.Winds in the area were about 48 mph，Kyodo News agency reported.

　　Authorities said they did not know how fast the train was going.Speed was believed to be a factor in an.April 25 train wreck that killed 107 people and injured more than 500 others in Amagasaki，western Japan.That accident was Japan’s worst train wreck since 1963.

　　68.This report is about a train accident that happened ________ .

　　A.in Yamagata on Sunday evening B.in Tokyo on Monday

　　C.in Niigata on Sunday evening D.in Amagasaki on April 25

　　69.Which of the following has not yet been made clear about the derailed train?

　　A.The number of its cars.

　　B.Its running direction.

　　C.The number of the survivors in its derailment.

　　D.The time of the train accident.

　　70.We can infer from the passage that ________ _.

　　A.speed was certainly a factor leading to the train derailment

　　B.authorities would try to find out the speed at which the train was running

　　C.the gust was strong enough to derail the train

　　D.the train operator was a careless man

　　71.The underlined word“wreck”in the last paragraph most probably means“ ________”.

　　A.operation B.business C.competition D.crash

　　68.A 69.C 70.B 71.D