已知（x2+y2-2）（x2+y2）=3，则x2+y2=（ ）。

（12分）已知等差数列｛a_n｝中，a₃＝－4，a₁＋a₁₀＝2，

（1）求数列｛a_n｝的通项公式；

（2）若数列｛b_n｝满足a_n＝log₃b_n，设T_n＝b₁·b₂……b_n，当n为何值时，T_n＞1。

It’s wise to find a place to travel ______ has a lot to present but hasn’t yet been hit by high price of admission as well as mass popularity．

A．where

B．that

C．in which

D．what

试述一氧化碳中毒时纠正缺氧的方法。

总库作业点识别码为（）。

A warehouse had a square floor with area 10,000 square meters. A rectangular addition was built along one entire side of the warehouse that increased the floor area by on-half as much as the original floor are-a. How many meters did the addition extend beyond the original building ？（）

A．10

B．20

C．50

D．200

E．500