问题 单项选择题 A1/A2型题

以下关于循环系统的神经调节不正确的是()

A.交感神经兴奋使心率加快

B.交感神经兴奋使心肌收缩力增强

C.交感神经兴奋α、β受体调节血液循环

D.副交感神经兴奋使血压升高

E.交感神经兴奋时通过肾上腺素能受体产生与副交感神经相反的作用

答案

参考答案:D

解析:本题考查了循环系统的神经调节。调节循环系统的神经有两组:一组是交感神经,兴奋时通过肾上腺素能α和β受体使心率加快,心肌收缩力增强,周围血管收缩,血压升高;另一组是副交感神经,兴奋时通过乙酰胆碱能受体使心率减慢,心肌收缩力减弱,血压降低。

单项选择题

C

If you are a fruit grower—or would like to become one—take advantage of Apple Day to see what’s around. It’s called Apple Day but in practice it’s more like Apple Month. The day itself is on October 21, but since it has caught on, events now spread out over most of October around Britain.

Visiting an apple event is a good chance to see, and often taste, a wide variety of apples. To people who are used to the limited choice of apples such as Golden Delicious and Royal Gala in supermarkets, it can be quite an eye opener to see the range of classical apples still in existence, such as Decio which was grown by the Romans. Although it doesn’t taste of anything special, it’s still worth a try, as is the knobbly(多疙瘩的) Cat’s Head which is more of a curiosity than anything else.

There are also varieties developed to suit specific local conditions. One of the very best varieties for eating quality is Orleans Reinette, but you’ll need a warm, sheltered place with perfect soil to grow it, so it’s a pipe dream for most apple lovers who fall for it.

At the events, you can meet expert growers and discuss which ones will best suit your conditions, and because these are family affairs, children are well catered for with apple-themed fun and games.

Apple Days are being held at all sorts of places with an interest in fruit, including stately gardens and commercial orchards(果园).If you want to have a real orchard experience, try visiting the National Fruit Collection at Brogdale, near Faversham in Kent.

What is the author’s purpose in writing the text?()

A. To show how to grow apples.

B .To introduce an apple festival.

C. To help people select apples.

D. To promote apple research.

多项选择题