【单选题】The stone chip is thought to be the most important tool because it _______.
A.
was one of the first tools
B.
developed human capabilities
C.
led to the invention of machines
D.
was crucial to the development of mankind
【简答题】喉癌分型正确的是 C A会厌癌 声门癌 喉咽癌 B喉室癌 梨状窝癌 声门癌 C 声门上癌 声门癌 声门下癌
【单选题】晶格常数为a的简立方晶格的(010)面间距为
【单选题】What happened one night?
A.
The dog fell iii and barked all night long.
B.
The dog played a trick on the speaker.
C.
The dog awakened the speaker and led him to help its master.
D.
The speaker had a nightmare in which he saved his neighbour's life.
【单选题】In the polar regions, the dog mainly ______.
B.
provided companionship
【单选题】当MCS-51复位时,下面说法准确的是( )。
【判断题】饭店提供的服务应当符合国家或行业标准,否则应当承担违约责任。
【判断题】饭店提供的服务应当符合国家或行业标准,否则应当承担违约责任。