学进去-教育应平等而普惠
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类型:七选五
难度系数:0.40
所属科目:高中英语

Fall is our favourite hiking season. It’s not too hot. The bugs are gone. Solitude (无人居住的地方) is easier to find. But fall hiking has its own complications, especially when it comes to weather. 1.

Protect your feet. Pamper your feet, and they’ll take you around the world. 2. A pair of suede or synthetic shoes will offer great comfort, without a big “breaking in” process. They dry fast, and aren’t tough on the wallet. If you’re going for longer treks (跋涉), then you’ll want footwear that offers support, comfort, weather resistance, and durability.

Backpacks. 3. Size. For a short hike, a daypack is best. It’s light, practical, and big enough to carry the essentials (you’ve looking for something between 15 and 35 L). For longer hikes, look for a pack between 30-50 L with an integrated frame (to prevent the bag from putting too much pressure on your back and shoulders).

Stay hydrated (含水的). Yes, the heatwaves of summer are probably gone for the year, but packing enough water is vital in any season. 4. For longer treks, consider a hydration reservoir, which can carry anywhere from 0.5 to 10 L. No need to search in your pack for your water bottle; just enjoy a sip from the handy tube.

5. Changeable fall can transform a sunny morning into a wet, cold afternoon. After a forest hike, the wind atop the lookout can bite. Dress in layers. If it’s warm, you can take a layer off to prevent sweating. If it’s cool, you can add a layer back on. Softshells are easily packable and light. They keep wind and water off, and are easy to take on and off as needed. Dressing for your trek? Check the forecast before hitting the trails.

A.Number one criterion?
B.Keep warm and dry.
C.Like only cheep shoes?
D.Just going short distances?
E.Having enough water will keep you energetic.
F.Before heading out, check out this handy fall hiking checklist.
G.For shorter hikes, this might just mean filling up your favourite water bottle.
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y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2

用户名称
2019-09-19

y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2

用户名称
2019-09-19
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