There was a ________ look on her face so I repeated the question. A. puzzled B. puzzling C. puzzle D. puzzlement
The boys crowded in two teams at the front of Charlene Skinner’s class as they thought over the math problem that flashed on the whiteboard. “That’s not right,” one boy said.
45.分析下表，以下推测不合理的是( ) 溶液双缩脲试剂碘液斐林实际 甲+－－ 乙－++－ 甲、乙混合+++ (注:“+”显色，“++”显色更深;“
制备单克隆抗体所采用的细胞工程技术包括（ ） ①细胞培养 ②细胞融合 ③胚胎移植 ④细胞核移植 A．①②
Many boys are in playing computer games.A．interestingB．interestedC．interestsD．interest.
下列各句标点符号使用错误的一项是（ ） A.到了60年代，物理学家格拉肖、温伯格、萨拉姆引用了杨先生1954年写的这篇文章中的数学结构，即非阿
The big tree is as tall as a _____ balding . A. two-storeys B. two-stories C. two-storeying D. two-storey
—When was the old car invented? —I think the car about one hundred years ago． A．invented B．was invented C．invents
