旅客将一只家猫带入列车内时，应按下列规定补收运费（）。A、按20千克补收四类包裹运费

森林群落中，按投影盖度通称为郁闭度，基部盖度通称为（）。

阅读理解。

     Everyone's at it, even my neighbors. I thought I might be the only person left in the world who

hadn't done an eBay deal. So, I decided to try my hand at online auction (网上拍卖).

      Buying for Beginners

      Sign up on www. eBay. co. uk. Most items (e.g. tables, computers and books) ready for auction will

come with a picture and a short description; others may be marked with"Buy It Now" and have a fixed price.

You can buy these right away.

      If the item is being auctioned, you offer the highest price you are prepared to pay and eBay bids (出价)

for you. The bid will be increased little by little until it goes beyond your highest bid, then you are emailed and

asked if you would like to bid again. Auctions last up to 10 days and when they finish, you get an email telling

you whether you have won the item.

       How to Pay

       Sellers decide how they would like to be paid and you need to check this before placing a bid as you

might not want to post a check or postal orders. The easiest way is through PayPal, an online payment system

that takes the money away from your credit card.

      Selling Made Simple

      If you plan to sell on eBay, it helps to include a picture of the item. I followed my friends' advice and put

up the items I wanted to sell for a 10-day auction, starting on a Thursday. This way buyers had two weekends

to bid.

      The big Things in Life 

      It's easy to post a small item, but furniture is a big part of eBay and this has to be collectively sent by

deliverymen. Check the ways of delivery before you bid.

1. What is the passage mainly about?

A. How to make payment online.

B. Ways of making delivery online.

C. How to use an online-auction system.

D. Advantages of an online auction system.

2. After bidding for an item, a buyer ______.

A. has chances to make higher bids

B. will get what he wants in ten days

C. should make payment immediately

D. may check its picture and description

3. The easiest way of making payment mentioned in the passage is ______.

A. through a local banking system

B. by sending the money to the seller

C. through an online payment system

D. by paying the deliveryman directly

已知桃树中，树体乔化与矮化为一对相对性状（由等位基因D、d控制），蟠桃果形与圆桃果形为一对相对性状（由等位基因H、h控制），蟠桃对圆桃为显性。下表是桃树两个杂交组合的实验统计数据：

根据甲组的杂交结果可判断，上述两对相对性状的遗传不遵循自由组合定律。理由是：如果这两对性状的遗传遵循自由组合定律，则甲组的杂交后代应出现（）种表现型，比例应为（）。

Linux文件系统的文件都按其作用分门别类地放在相关的目录中，对于外部设备文件，一般将其放在（）目录中。

A./bin

B./etc

C./dev

D./lib

职业价值观是人们在职业生活中表现出来的一种（）

A、价值取向

B、目标取向

C、职责取向

D、职位取向