下图为某染色体结构发生变异的示意图，该变异类型为( ) A．缺失 B．易位 C．倒位 D．重复
（2010·吉林市普通中学届高三下学期期中教学质量检测） 14. So little _______ that the neighbor could not settle their difference. A. they agreed
The students at Sandy’s high school were badly shaken by the news that a classmate had 11 himself. On the suicide note was written: “It’s hard to 12 when nobody cares if you die.” Gle
具有排泄作用的皮肤结构是 A. 汗腺 B. 表皮 C. 皮脂腺 D. 毛囊
补写出下列名篇名句中的空缺部分。(6分) (1)________________，内无应门五尺之僮。 (李密《陈情表》) 群贤毕至，_______________。 (王羲之《兰亭集
If you use 4 eggs to bake a cake and your child eats 2 of the 8 pieces of the cake, then that is ____ to eating one whole egg.（ ） A. same B. similar C. equal
如图所示，闭合矩形线圈abcd与长直导线MN在同一平面内，线圈的ab、cd边与MN平行，当MN通以逐渐增大的电流时A．ab边所受磁场力方向一定向右 B．ab
菜谱中记载：河虾不宜与西红柿同食．主要原因是河虾中含有五价砷，西红柿中含有比较多的维生素C，两者同食时会生成有毒的三价砷．下列说法不正
