内容正文:
课时分层作业(四)
Ⅰ.单词拼写
1.Both involve(包含) somewhat the same basic information.
2.We will then have a firmer foundation(基础) of fact on which to build theories.
3.Our institute(研究院) has ordered a great many instruments from the company.
4.The polluted air and water are harmful(有害的) to people's health.
5.I was bothered(烦恼的) about the blister on my hand.
6.Why do you think others might have an opposing view(观点)?
7.The child couldn't keep his balance(平衡) on his new bicycle.
8.We recycle(再利用) all our empty food and drink cans.
9.His movie of the extinction(灭绝) of dinosaurs is a great success.
10.Britain's future as a leading industrial(工业的) nation depends on investment.
Ⅱ.阅读理解
A
To walk is to be human.We're the only creature that gets around by standing up and putting one foot in front of the other.In the more than 4 million years that humanity' s ancestors have been using only two legs for walking, our ability to walk upright has allowed humankind to travel great distances and survive changing climates, environments and landscapes.
But walking is more than just transportation.It also happens to be really good for us.Countless scientific studies have found that this simple act can provide a number of health benefits and help people live longer.In fact, a walking routine — if done properly — might be the only exercise people need.
How much walking should one aim for? You've likely heard we need 10,000 steps a day.That's about 5 miles.But contrary to popular belief, this recommendation doesn't come from science.Instead, it stems from a 1960s advertising campaign to promote a pedometer(计步器)in Japan.Perhaps because it's a round number and easy to remember, it stuck.
Since the 1960s, researchers have studied the 10,000stepsaday standard and have turned up mixed results.Although 10,000 steps is certainly a healthy and worthwhile goal, it's not a onesizefitsall recommendation.
For instance, a recent Harvard University study involving more than 16,000 senior women found that th