通过合理的膳食和科学的烹调加工，能向机体提供足够数量的能量和各种营养素，并保持各营养

阅读短文，判断正误。

     Betty,

     I hope you're well. I'm on holiday in London with my friend Jenny. We arrived by plane last

Monday and took a taxi to our hotel. I went for a walk in Hyde Park but Jenny didn't come with

me because she was tired. 

      Then on Tuesday we saw the clock, Big Ben, and Buckingham Palace. Queen Elizabeth lives

in the Palace, but we didn't see her! I bought some presents but Jenny didn't buy anything!

     The next day we visited the British Mueseum and had dinner in a Chinese restrant!

     On Thursday morning we relaxed. Then we went to Tower Bridge on the River Thames and

looked at the city. It's very big!

     Finally today I did some shopping and Jenny listened to a concert in the park. I came back to

the hotel and read the newspaper. Then I worte some postcards and sent some emails. I took lots

of photos and I'm sending them with this e-mail to you!

     Tomorrow we're going to fiy home. It was a short holiday,but it was great! Say hello to Mum

and Dad. 

                                                                                                                                 Love, 

                                                                                                                                 Gran

( ) 1. They arrived in London last Sunday.

(     ) 2. On Wednesday they saw Big Ben and Buckingham Palace.

( ) 3. OnThursday they saw the River Thames and visited Tower Bridge.

( ) 4. Today they spent the day at the hotel.

( ) 5. Gran did some shopping on Friday.

水压试验用压力表不得少于两个，分别装在最高处和最低处，试验压力应以（）的压力读数为准。

A、最高处

B、最低处

C、最高处和最低处的平均值

D、最高处和最低处的压力之和

最近发现一种O₄新微粒，有关这种新微粒的说法正确的是(  )

A．它是一种化合物

B．它的摩尔质量为64

C．由该微粒构成的物质是氧的一种新的同素异形体

D．它是由两个氧分子通过分子间作用力结合而成的新微粒

下列属于资本项目的是（）。

A.劳务收支

B.单方面转移

C.企业信贷

D.捐赠

有位买家来您店铺里拍下商品，拍下后多少天内买家没有付款的，这笔交易会自动关闭？（）

A.三十天

B.三天

C.系统不会自动关闭交易，只有卖家可以关闭交易

D.十五天