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1. 阅读理解
The spine (脊柱)
stands at the center of your health, providing your body with structure and
support. It also contains a major collection of nerves that deliver electric
signals from the rest of the body to your brain. So it's important to take care
of it.
Staying in a good position is one of the most important things to keep
your spine healthy. A proper position means standing or sitting while keeping
your spins straight, except for its natural bending. Positions play a vital
part even when you're asleep. Stomach sleeping is far from a good idea. Many
people prefer sleeping on their side, which is in the interests of their spine.
Sleeping on your back has lots of benefits yet can cause lower back pain and
put some pressure on your spine.
Staying still for too long — even if your position is good — can be hard
on your back. Especially if you work at a task most of the day, it's important
to get up and stretch (伸展)
periodically. Strength exercises with light weights like push-ups can also help
by strengthening the muscles. However, don't overdo the exercise, as repeated
movements can hurt the muscles around the spine, as trying to lift heavy
weights with poor technique.
Vitamins also affect the health of your spine. In particular, vitamin B
and omega-3 fatty acids help keep nerves healthy. Another important part is
vitamin D, which is required for strong bones. Vitamin D can come from some
foods, but it's also absorbed from sunlight, so it may help to do some
exercises outside. At last, many of the actions necessary to keep a spine
healthy are similar to those used to protect your health in other ways. So
protect your back, and the rest of the body will benefit.
（1）Which sleeping position is best for our spine according to the passage?
A . 
B . 
C . 
D . 
（2）What is suggested in paragraph 3?
A . Strengthening muscles around the spine.
B . Repeating a certain movement more.
C . Doing a proper amount of exercise.
D . Staying still in a good position.
（3）What can we infer about vitamins?
A . Vitamin B reacts with omega-3 fatty acids.
B . Abundant vitamin D guarantees strong bones.
C . Vitamin D can't be absorbed without sunlight.
D . Doing push-ups outside increases vitamin D intake.
（4）What is the best title for the text?
A . Stay still, stay healthy
B . Good position, good spine
C . Healthy means, healthy spine
D . Proper exercise, proper weight
