问题 选择题

下面说法中正确的是(  )

A.曲线运动一定是变速运动

B.平抛运动是匀速运动

C.匀速圆周运动是匀速运动

D.只有变力才能使物体做曲线运动

答案

A、无论是物体速度的大小变了,还是速度的方向变了,都说明速度是变化的,都是变速运动,做曲线运动的物体的速度方向在时刻改变,所以曲线运动一定是变速运动.所以A正确.

B、平抛运动,只受重力,因此存在加速度,所以是匀变速曲线运动,故B错误.

C、匀速圆周运动受到的向心力是始终指向圆心的,合力垂直于初速度方向的方向,并不一定始终与速度的方向垂直,所以速度大小不变.故C错误;

D、变力可以作直线运动,也可以做曲线运动,所以D错误.

故选A.

单项选择题 A1/A2型题
阅读理解

Hanukkah

Hanukkah (光明节) is a Jewish festival. It is celebrated on the 25th day of the Jewish month of Kislev (犹太教历), which is usually sometime in December. It is often called the festival of lights. The festival celebrates the time, over 2,000 years ago, when the Jewish people fought against an emperor who would not let them follow their own traditions and religion. When the Jewish people won back their temple in Jerusalem, they found there was only enough holy oil to keep the sacred light burning for one day. However, to their surprise, this small amount of oil kept the light burning for eight days and nights, until the people had time to make more oil.

At the center of the Hanukkah celebrations is a candlestick (called a Menorah) that holds nine candles. On the first night of Hanukkah the first candle is lit, and each day this candle is used to light another candle, until on the eighth day, the last day, all the candles are lit. During Hanukkah, people go to the synagogue (犹太教堂) to pray and to remember the miracle (奇迹) of the holy oil. Hanukkah is a time for family and friends to come together. People exchange gifts and greeting cards, and children go to parties. Parents often give their children money at Hanukkah. Potato cakes, called latkes, are a traditional Hanukkah food.

小题1:For how many days does Hanukkah last?

A.7

B.10

C.9

D.8小题2:According to the passage, what is necessary when celebrating Hanukkah nowadays?

A. Candles.

B.Money.

C.Oil

D.Cards.小题3:What does the Menorah remind Jewish people about?

A.The war that they fought 2,000 years ago.

B.The God that they honored best.

C.The miracle of the holy oil that happened 2,000 years ago.

D.The church they built 2,000 years ago.小题4:The passage mainly tells us about _____.

A.the history of Hanukkah and how it is celebrated

B.why Jewish people celebrate Hanukkah

C.why Jewish people protect their traditions

D.the miracle of the holy oil in the Jewish temple