题干

如图,点A是直线l外一点,在l上取两点B,C,分别以A,C为圆心,BC,AB长为半径画弧,两弧交于点D,分别连接AB、AD、CD,则四边形ABCD一定是(  )


A:平行四边形

B:矩形

C:菱形

D:正方形

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答案(点此获取答案解析)

A

同类题2

阅读短文及文后选项,选出可以填入空白处的最佳选项, 并在答题卡上将该项涂黑。

    It is fun being a vet. ____, every day is different! It all depends on what is wrong with the animals that come in.

    At my clinic, I work long days on Mondays, Wednesday and Fridays, and short days on Tuesday, Thursday and Saturdays. Sunday is my day off so I can spend some time with my family.

    ____ My clerk opens the door, turns on some music, and makes everyone a cup of tea or coffee. My assistant cleans and feeds the animals. The phones start to ring, and people make appointments. This is a very busy time of day!

    At 9 am, pet owners start to arrive with their sick pets. Appointments take up the whole morning.

    ____ I don't examine any new sick animals. I use these two hours to have lunch and do all my paperwork.

    At 2 pm, I start to see sick animals again. At 5 pm, three students from a local school who love animals arrive to help out. ____ I am always happy to see their smiling faces!

    From 5 pm to 7 pm, I continue to see sick animals. Then, at 7 pm we close our doors and the clean-up begins! We tidy the clinic and feed and clean the animals Of course, we also stroke (轻抚) them and give them hugs !Then, we turn off the lights and go home. ____

    I'm very happy being a vet, though unexpected things sometimes happen!

A. I like it because although it is hard work

B. At midday, I stop for two hours.

C. My day at my clinic begins at 7 am.

D. This is the type of the day I want to have.

E. They are very kind and warm-hearted.