题干

纳米比亚西岸的纳米布沙漠是世界上最古老、最干燥的沙漠之一。该区城年降雨量不到25毫米,水汽来自夜间所形成的露水以及海雾。植物叶面的气孔在呼吸作用等气体代谢中成为空气和水蒸气的通路,有重要的生理作用,读下图纳来比亚及周边地区示意国完成下列各题。

上一题 下一题 0.0难度 选择题 更新时间:2016-11-11 12:21:07

答案(点此获取答案解析)

同类题5

阅读理解

    A family is a collection of people who share the same genes(基因)but cannot agree on a place to pull over for lunch. Ed and I, plus his parents and sister Doris and eight-year-old niece Alisha, are on a road trip to Yosemite. Ed wants Subway, I want. In-N-Out Burger, Doris wants Sonic. In the end, we compromise on McDonald's, where Alisha will get an action figure.

    It's a three-hour drive to Yosemite, but we're taking a little longer, as we're working in a tour of Highway 80's public restrooms. As the saying goes, “Not one bladder(膀胱)empties but another fills.” Many of these restrooms belong to gas stations. I prefer them to the high-tech ones on planes.

    We get back on the road. Ed is driving now. When all the tabloids(小报)have been read, the travel has grown tedious and anyone under age 12 asks “Are we there yet?” at ever-shortening internals. Just outside Manteca, California, we stop for coffee. At a Starbucks checkout, Ed buys a CD of Joni Mitchell's favorite musical picks. The hope is that it will have a calming effect.

    As we pull back onto the highway, it starts to pour. Then something amazing happens. As we climb the mountain, the rain turns to snow. The pines are spotted with white. We're struck dumb(说不出话)by the scene outside. For a solid 15 minutes, everyone forgets about their bladder, their blood sugar and the temperature. Alisha has never seen snow, so we pull over to make snowmen and catch snowflakes on our tongues. Then Ed realizes we need tire chains, and we have to turn back and drive 30miles to Oakhurst. “Good,” says Doris. “There was a very nice restroom there.”