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    Travelling around the Sydney district is a wonderful experience.

    The sightseeing options are____(end), but most travelers begin on the harbor at the Sydney Opera House. Known as one of the wonders of the world, it is ____photographer's dream.

    There is a huge ____(choose) of accommodations available in the city and its surrounding area. Darling Harbor is famous for its restaurants and four-star hotels. Under the famous Sydney Harbor Bridge is the Rocks shopping district, which ____(call) “the heaven of shoppers”. You can spend at least a half day____ (wander) through the alleys and side streets to take____everything the shops offer. On the other side of harbor ____(lie) another must-visit spot, the Taronge Park Zoo. With an exciting collection of native animals, including lions and giraffes,____is rare to find a zoo with a view of Darling Harbor and the city skyline.

    The Royal Botanic Garden is within walking distance of the Opera House, and is an absolutely perfect place for a picnic lunch. After lunch, take a walk to Sydney Tower,____you can get 360-degree____(forget) views of the city.

当|a|≤1，|x|≤1时，关于x的不等式|x²﹣ax﹣a²|≤m恒成立，则实数m的取值范围是（　　）

a、b两车在平直公路上沿同一方向行驶，运动的v﹣t图像如图所示，在t=0时刻，b车在a车前方s₀处，在t=t₁时间内，a车的位移为s，则（   ）