. Despite all the evidence to the contrary, the witness _____ that his story was true. A. stuck out B. stood out C. kept down D. held up
在适宜的温度、水分和CO2条件下，分别测定强光和弱光时不同植物的光合作用如下图所示，请据此判断，下列叙述不正确的是
–Mum, I failed again in today’s examination. --Oh, ________. The world is not _______. A. come up; at its end B. Cheer up; in the end C. Look up; at the end D. Take it easy; at an end
《荀子》记载：“(周公)兼制天下立七十一国，姬姓独居五十三人。”此事最能说明： A．分封制在周初扩展了西周疆域 B．周公是分封制的开创者 C
（12分）在我国封建社会里，隋唐时期是一个繁荣与开放的时期。请举例说明“繁荣与开放”的表现，并简要分析其原因。
--I am going to London to watch the Summer Olympic Games next month. -- ! A. Have a good time B. It's terrible C. Good jo
番茄是自花授粉植物，已知果实颜色有黄色和红色，果形圆形和多棱形。控制这两对性状的基因位于两对同源染色体上。下表是有关的杂交及数据统计
Nothing that he did was right, ________? A. did he B. didn’t he C. wasn’t it D. was it
中，自变量x的取
值范围是 ▲ ． 
解析: