The report came to the British on May 21, 1941. The German battleship Bismarck, the most powerful warship in the world, was moving out into the Atlantic Ocean. Her task: to destroy the ships
为了验证某大豆品种的矮化特性与赤霉素的含量有关，请用所给的实验材料，完成下列实验步骤并回答有关问题： 实验材料：具2片真叶且长势相同的该
Mr. Smith has done some research on wild animals for 20 years. --- Oh! He must have _________ a lot of difficulties. A. given in B. cared about C. joined in
下列除杂过程中，所选用的试剂或方法不正确的是 A. 固体中混有：充分加热固体混合物 B. 溶液中混有：加入过量的铁粉，过滤 C. 溶液
科学家们用小鼠骨髓瘤细胞与某种细胞融合，得到杂交瘤细胞，经培养可产生大量的单克隆抗体，与骨髓瘤细胞融合的是 （
下图《棉花图・收贩》反映了明朝时期农业生产的发展趋势是（ ） A．引进高产作物逐步取代传统农作物B．棉花的种植区域在明朝中后期进一
如图，路边有一根电线杆AB和一块半圆形广告牌，在太阳光照射下，杆顶A的影子刚好落在半圆形广告牌的最高处G，而半圆形广告牌的影子刚好落在平地
The sportsman didn’t manage to break _____ record, but it was _____ good try.A. a; the B. the; a C. a; 不填 D. the; 不填
