26.The minister stressed that under no circumstances ____ the disabled to be looked down upon.
A.is B.are C.has D.have
25.It seems as if they are going to ____ us a lot of money for the party hall.
A.cost B.ask C.demand D.charge
24.It was with great excitement one morning in July ________ the young man read a classified advertisement.
A.when B.that C.who D.which
23.It is obvious that this anti-smoking ____ is mainly aimed at young teenagers.
A.campaign B.war C.battle D.fighting
22.He admitted that when ____ comes to repairing a computer, he had little knowledge of it .
A.he B.that B.this D.it
第一节:单项填空(共15小题,每小题1分,满分15分)
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该选项的标号涂黑。
21.-Do you think the weather is good enough for the picnic?
-Yes.You couldn't hope for ____ day at this time of the year.
A.a nice B.the nice C.a nicer D.the nicest
8.[解析]:⑴炸弹作平抛运动,设炸弹脱离飞机到击中目标所飞行的水平距离为x,,
联立以上各式解得
设击中目标时的竖直速度大小为vy,击中目标时的速度大小为v
联立以上各式解得
⑵①当筒不转动时,物块静止在筒壁A点时受到的重力、摩擦力和支持力三力作用而平衡,由平衡条 件得摩擦力的大小 支持力的大小
②当物块在A点随筒做匀速转动,且其所受到的摩擦力为零时,物块在筒壁A点时受到的重力和支持力作用,它们的合力提供向心力,设筒转动的角速度为有
由几何关系得 联立以上各式解得
7.[答案]
[解析]由机械能守恒定律得
在圆轨道最高处:
联立以上各式得
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