对下列物理量的认识中,最接近实际的是( )
A:托起两个鸡蛋的力约为10 N
B:初中物理课本的长度约为26 cm
C:人体感到舒适的温度是40℃
D:一个普通中学生的质量约为500 kg
短文填空:先通读下面的短文,然后根据短文内容和所给首字母,在空格内填入一个适当的单词。使短文完整。所填单词必须在答题卡标有题号的横线上完整写出。 On Thanksgiving Day. About 88 percent of Americans eat turkey. But one l ____ turkey not only survives but also becomes famous! Every year, turkey farmers p ____ a turkey to the U.S. president. However the president does not e ____ this turkey. But gives in a “pardon”. The turkey is s____ to Florida for a Thanksgiving parade. Then it lives on a farm for the r ____ of its life. Turkeys come from North America and have been part of American culture for c____ . Benjamin Franklin even wanted the turkey, i ____ of the bald eagle, to be America's icon. Turkeys living on farms are large birds that cannot fly. But w ____ turkeys are quite fast. They can fly at a s ____ up to 88 kilometers per hour. They can also run as fast as 40 kilometers per hour. Turkeys don't have ears. They h ____ with a snood (肉垂) above their beaks. But their hearing is five times better than human's.
书放在水平桌面,书受到重力作用G,书对桌面有向下的压力F,桌面对书有向上的支持力N.
若集合M = {x ∈R | 2 x ≥ 4},N = {x∈R | x 2-4 x+3 ≥0},则M∩N =( )
句子配对
____Is this your school? A. It's in the kitchen.
____Where is your cat? B. Yes, it is.
____Where are your books? C. No, he isn't.
____Is he in the kitchen? D. Yes, they are.
____Are they near the phone? E. They are under the table.