How do elephants drink water with trunks?

[Drunky]

English Language Tests, Intermediate level

ESL/EFL Test #735 "Vocabulary Practice: Elephants", question 3

Elephants have large ........., that look like long noses, but they use these to pick up food and other material as well as drink water.

(a) trunks
(b) tanks
(c) snouts
(d) tails

English Language Tests, Intermediate level

ESL/EFL Test #735 "Vocabulary Practice: Elephants", answer 3

Elephants have large trunks, that look like long noses, but they use these to pick up food and other material as well as drink water.

Correct answer: (a) trunks

Your answer was: incorrect
Elephants have large snouts, that look like long noses, but they use these to pick up food and other material as well as drink water.
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I WONDER HOW WITH TRUNKS ELEPHANTS CAN DRINK WATER?

nelko

[Mister Micawber]

They use their trunks like we use drinking glasses: they put water in them and then squirt it into their mouths.
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Native English teacher at Mister Micawber's

[Jignesh]

Elephants have large trunks, that look like long noses, but they use these to pick up food and other material as well as drink water.

Why we don't use "to" in the later part of the sentence. as

Elephants have large trunks, that look like long noses, but they use these to pick up food and other materialas well as "to" drink water.

Thanks for your clarification advance

[Mister Micawber]

The 'to' is optional.
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Native English teacher at Mister Micawber's