1937年抗战爆发以后，原来割据一方的地方各派军阀纷纷请缨杀敌，电报如雪片般飞向南京。在整个抗战期间，川军、滇军、晋军、桂军等地方部队奋战
–Can I use your pen? –__________.A．Excuse me. I can’tB．Excuse me. You can’tC．Sorry. I don’t have oneD．Sorry. You don’t have one
— 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
的值域为
，则
的取值范围是 ▲ ．
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