阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。
A
Marvel at the incredible collection consisting of over 140 species including 300 sharks, rays and the largest collection of Sand Tiger sharks in the world． Walk along the Rainforest, Rocky Shore and Living Ocean environments at the Underwater Zoo and you'll find yourself face to face with dangerous Piranha, Giant Catfish, playful Otters, a Humbolt Penguin colony and more．
Options
Basic pass: With this basic pass, you'll get access to the Aquarium tunnel and Underwater Zoo．
Explorer pass: If you're looking to get a little close to the sea creatures then this pass is for you． Along with the researcher pass you also get access to the submersible simulator & big screen theater and a free ride on the glass bottomed boat．
VIP line buster: This ultimate pass includes all the benefits of an Explorer pass, with a tour guide and you get to try your hand at fish feeding!
Timings
Sunday—Wednesday: 10：00 am—11：00 pm
Thursday—Saturday: 10：00 am—12：00 am
Pro Tip
You can save a lot by purchasing a combo ticket． This ticket gives you access to Underwater Zoo and Aquarium Tunnel alongside tickets to the observation deck on the 124th floor of the Burj Khalifa． Government ID card has to be presented for entry．
Tickets
Your voucher will be emailed to you shortly． Please display the same at the time of entry at the security line on your mobile phone with a valid photo ID．
21．What can you do if you have an explorer pass?
A．Have a tour guide． B．Feed the fish in person．
C．Talk to the researcher． D．See the sea creatures closer．
22．What should you choose to buy if you want to save money?
A．A government ID card． B．A combo ticket．
C．A VIP line buster． D．A valid photo ID．
23．When can you visit Dubai Aquarium Underwater Zoo?
A．At 9：00 am Tuesday． B．At 11：00 am Wednesday．
C．At 3：00 pm Thursday． D．At 5：00 pm Saturday．
