挪威数学家阿贝尔，年轻时就利用阶梯形，发现了一个重要的恒等式——阿贝尔公式：图是一个简单的阶梯形，可用两种方法，每一种把图形分割成为两个矩形．利用它们之间的面积关系，可以得到：=（ ）
一John，I wonder ___________________________.
一My teachers.It's impossible for me to get such great success without their help.
why you work so hard
what you have achieved
who you want to thank most
It is said Zhang Sanfeng created tai chi（太极）after watching a fight between a snake and a bird. ，many movements in tai chi have names of animals.
In fact
In total
In time
The play Teahouse __________ by the famous Chinese writer Lao She.
wrote
was writing
was written
time flies!Our middle school life is coming to an end.
How
What
What a
Many tourists visit Hainan around the Spring Festival，because it's _______ too cold _________ too hot.
both...and
not only...but also
neither...nor
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