题目

— You really went to the park last weekend?               — Yes, I go there. Look! This is a photo of me in the park.             A. will                          B. would           C. do                  D. did 答案：C植物体细胞杂交尚未解决的问题有A．去掉细胞壁，分离出有活力的原生质体B．让杂种植物按照人们的需要表现出亲代的优良性状C．将杂种细胞培育成植物D．培育出属间杂种植物