问题
单项选择题
如果以纵轴表示价格，横轴表示供给量，在一般情况下，供给曲线是一条( )。
A．由左下向右上倾斜的曲线
B．由左上向右下倾斜的曲线
C．平行于横轴的直线
D．平行于纵轴的直线
答案
参考答案：A
解析： 本题考查农产品供给曲线。在一般情况下，农产品供给曲线是一条自左下方向右上方倾斜的曲线，这表明供给价格与供给量呈同方向变动。
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如果以纵轴表示价格，横轴表示供给量，在一般情况下，供给曲线是一条( )。
A．由左下向右上倾斜的曲线
B．由左上向右下倾斜的曲线
C．平行于横轴的直线
D．平行于纵轴的直线
参考答案：A
解析： 本题考查农产品供给曲线。在一般情况下，农产品供给曲线是一条自左下方向右上方倾斜的曲线，这表明供给价格与供给量呈同方向变动。
Bats are amazing animals. There are many kinds of them. Most bats are black or grey in colour. And they have wings, too. Many people believed that bats couldn’t see. In fact, Bats can always find their way around very well. Usually, bats live in caves and trees. They can fly to their homes from far away. Some scientists said, “Bats can see with their ears.” Is it right? Most bats make a sound. The sound is too low for our ears to hear. They screech（尖叫） when they move around, and the echoes（回声）of these cries come back to their ears. In this way, they are able to tell where walls and other things are. Bats go out to eat at night. In the daytime they hang close together in their caves, trees or other dark places. Only when evening comes，they begin to come out and look for food, In the morning they come home to sleep until the next night. Some people think of bats as bad animals. In fact, they are very useful animals. Most of them catch bad insects（昆虫）for food. Some bats eat flowers and fruit as well.
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