— Mary told me she would meet me at yesterday’s party. But she didn’t turn up. — It is a pity that she broke her ________ . A. promise B. heart C. habit D. rule
The early settlers in the jungle didn’t have such advanced equipment _____ we have today to fight against natural disasters and many a time they _____ despair(绝望) but they survived somehow. A.
---Did Mike go with you in the end?---No, but I ______ him to. A. agree B. hoped C. suggested D. advised
艾滋病除通过性传播外,还会通过( ) A.水源传播 B.握手传播 C.输血传播 D.空气传播
如图所示,半径为R,重为G的均匀球靠竖直墙放置,左下有厚为h的木块,若不计摩擦,用至少多大的水平推力F推木块才能使球离开地面?
夏季晴朗的一天,甲乙两株同种植物在相同条件下CO2吸收速率的变化如图所示。下列有关 叙述错误的是 A.对于甲植物,a点所表示的含义是此时光合
(5分)如图所示,一储油桶,底面直径与高均为d,当桶内无油时,从某点A恰能从桶边缘看到桶底B点,当桶内油的深度等于到桶高一半时,由点A沿AB看
在物理和化学的学习中常用到一些科学研究方法,下列研究中主要科学方法相同的是( ) (1)探究影响力的作用效果的因素 (2)用总电阻替代两个