【单选题】紫茎泽兰是一种侵占性极强的恶性杂草,原产墨西哥,后来作为观赏植物被引进欧洲、澳洲等地。近年来在我国西南部地区蔓延,所到之处粮食减产,牧草退化,人畜过敏甚至中毒。国外一些地区用紫茎泽兰的天敌食蝇来控制它的数量,因此,我国西南部地区引进这种食蝇可以抑制紫茎泽兰的危害。 以上结论是基于以下哪一项假设
A.
在国外某些地区用这种食蝇来控制紫茎泽兰比其他的方法更有效。
B.
这种食蝇能够在中国西南部地区存活下来并吃掉大量的紫茎泽兰。
C.
在中国西南部地区没有与这种食蝇相类似的昆虫。
【判断题】对带负载线路发生的火灾,灭火是应先停掉负载,再切断着火现场电线。()
【单选题】()是饭店按照一定的时间用期,定期向员工发放的固定报酬。
【简答题】分层剖切的剖面图,应按层次以( )将各层隔开,波浪线不应与任何图线重合。
【单选题】听力原文:It's said that David suffered much this month because he narrowly escaped being arrested on charges of stealing laptop computers. (27)
A.
David was not put in jail.
B.
David escaped when the police found out that he was a thief.
C.
David was arrested because of stealing computers.
D.
David who's in charge of laptop computers escaped from being arrested.
【单选题】听力原文: Zachary Taylor was elected as the 12th president in 1849. It's surprising because he was the first president that didn't have any political experience. The main reason he was chosen as a candida...
A.
He was well-known on the West Coast.
B.
He made many political achievements.
C.
He supported financial aid to farmers.
D.
He was a popular war hero.
【简答题】For the __1__ of his life, Cliff kept running. Over the years, despite increasing age and __2__ , he ___3_ many races and won a number of them. It was said that Cliff Young never kept a single __4__. ...
【判断题】通过观察平纹织物的外观,根据平纹织物的细密程度,可以初步判断平纹织物生产机型、机号等内容。