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Let’s go step by step to match each object with the best metric unit for its height or length.

We’ll use common sense and real-world knowledge:

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1) Ferris Wheel
Ferris wheels are huge — like at amusement parks. They’re not 5 meters (too small), not 23 meters (still too small for a big one), definitely not 50 kilometers (that’s longer than most cities!).
Actually, many large Ferris wheels are around 50–100 meters tall. But looking at options:
A. 30 centimeters → way too small
B. 5 meters → still too small (like a house)
C. 50 kilometers → WAY too big
D. 23 meters → possible for a medium-sized one? Wait — actually, some smaller Ferris wheels can be ~20–30m. But let’s check others first.

Wait — maybe I misread. Let me think again.

Actually, standard Ferris wheels in theme parks are often over 50 meters, but since 50 km is absurd, and 23 m is plausible for a smaller one… Hmm.

But wait — look at option C: “50 kilometers” — that’s impossible. So probably D: 23 meters is the *best* among these? Or maybe B: 5 meters? No, 5 meters is only about 16 feet — too short.

Actually, let’s compare to known objects:

- A door is about 2 meters high.
- A horse is about 2 meters tall at shoulder.
- An 11-story building? Each story is ~3 meters → 33 meters total.

So Ferris wheel should be taller than a horse, taller than a door, maybe similar to a multi-story building.

Looking back at options for #1:

A. 30 cm → no
B. 5 m → too short
C. 50 km → ridiculous
D. 23 m → reasonable for a medium Ferris wheel

✔ So D. 23 meters

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2) Screw
Screws are small. A typical screw might be 2–5 cm long.

Options:
A. 20 cm → too long (like a ruler!)
B. 25 mm → that’s 2.5 cm → very reasonable
C. 3 cm → also reasonable, but 25 mm = 2.5 cm, so close
D. 1 meter → no

Between B and C — 25 mm is more precise for a small screw. Many screws are labeled in mm.

✔ B. 25 millimeters

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3) Can of Beans
A standard food can is about 10–15 cm tall.

Options:
A. 120 cm → over a meter — too tall
B. 2 meters — no
C. 2 kilometers — no
D. 10 cm → perfect! That’s about right.

✔ D. 10 centimeters

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4) Flash Drive
USB flash drives are small — usually 5–8 cm long.

Options:
A. 30 cm — too long
B. 60 cm — nope
C. 6 cm — yes! Very typical
D. 15 cm — too long

✔ C. 6 centimeters

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5) Adult Horse
Horses stand about 1.5 to 1.8 meters at the shoulder. Some up to 2 meters.

Options:
A. 90 cm — that’s 0.9 m — too short (pony size)
B. 2 meters — yes, for a large horse
C. 25 mm — no
D. 30 cm — no

✔ B. 2 meters

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6) Recliner (chair)
A recliner chair is about as tall as a person sitting — maybe 90 cm to 1 meter when upright.

Options:
A. 60 cm — a bit short
B. 1 meter — good estimate
C. 120 cm — 1.2 m — possible, but a bit tall
D. 10 mm — no

Most recliners are around 90–100 cm tall. So 1 meter is best.

✔ B. 1 meter

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7) 11 Story Building
Each floor is roughly 3 meters high (including ceiling/floor thickness).

11 × 3 = 33 meters.

Options:
A. 1 meter — no
B. 3 kilometers — way too big
C. 335 centimeters = 3.35 meters — too short
D. 30 meters — closest to 33 m

✔ D. 30 meters

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8) Key
House keys are small — usually 5–7 cm long.

Options:
A. 5 cm — perfect
B. 2 meters — no
C. 15 cm — too long (like a ruler)
D. 150 cm — no

✔ A. 5 centimeters

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9) Notebook Paper
Standard notebook paper (like A4 or letter size) is about 28 cm long (for letter: 11 inches ≈ 28 cm; A4 is 29.7 cm). But sometimes they mean width? Usually we measure the longer side.

Wait — options:

A. 15 cm — too short (that’s like half a page)
B. 1 meter — too long
C. 60 cm — too long
D. 25 cm — close to 28 cm — best choice

Actually, many notebooks are slightly smaller — maybe 25 cm is acceptable.

Alternatively, if it’s spiral-bound notebook, sometimes 25 cm is used.

✔ D. 25 centimeters

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Now let’s list all answers:

1) D
2) B
3) D
4) C
5) B
6) B
7) D
8) A
9) D

Final Answer:
1. D
2. B
3. D
4. C
5. B
6. B
7. D
8. A
9. D