粪便外观呈白陶土色，最可能的是（）。 A.消化道溃疡 B.阻塞性黄疸 C.胃癌 D.

下列命题：①将一枚硬币抛两次，设事件M：“两次出现正面”，事件N：“只有一次出现反面”，则事件M与N互为对立事件. ②若事件A与B互为对立事件，则事件A与B为互斥事件. ③若事件A与B为互斥事件，则事件A与B互为对立事件. ④若事件A与B互为对立事件，则事件A+B为必然事件. 其中，真命题是                         ( )

A．①②④

B．②④

C．③④

D．①②

基础生态学来源于下列（）学科。

A.植物学

B.动物学

C.古生物学

D.生物学

If you had got up early, you_____ the early bus.

A．have caught

B．will have caught

C．would have caught

D．had caught

阅读理解。

     On Christmas morning, I went to the Cockhedge Mall. People there were all busy buying their last

minute requirements. I needed to buy a birthday card for my son-in-law whose birthday is the 29th of

December. Picking up a few more things as well as my cared I went to join the line for the express

checkout which was for people who only had a few items in a basket and not a trolley load. This line

was next to the Customer Service desk.

     Seemingly waiting quite a long time, I was jogged out of my thoughts by a voice behind me making

comments on the things I bought.

     It was so funny when I realized that she was describing the contents of my basket. The owner of the

voice was a very pretty young lady. I said to her that I was going to buy a box of Christmas cookies but

the only ones left were not to my liking. The lady told me that just opposite Cockhedge in Superdrug they

had lots of cookies. I said, "I'm not going to bother now. I had enough of shops and I'm going home."

     The assistant from the Customer Service came across at this time saying"If there is anyone in the line

with a few items in their basket, none of which needed to be weighed, I will check out their groceries at

the desk." Because I had the sprouts (豆芽菜) which needed to be weighted, the young lady accepted the

offer and walked away waving goodbye.

     Eventually my turn came at the checkout. I was walking away when I met my new friend once again

who handed me a beautiful box of Christmas cookies. With a big hug she said "Hope you have a lovely

Christmas." She had been into Superdrug to buy me the cookies while I was still queuing in Cockhedge.

     What a generosity to a stranger! I was so surprised you could have knocked me down with a feather.

My Good Samaritan would never know what a joyful Christmas day I had with my family. Telling them

this story, as we ate around the table, kept everyone spellbound.

1. The underlined word "spellbound" in the last paragraph probably means _____.

A. interested

B. disappointed

C. astonished

D. frightened

2. Which of the following could be the best title of the story?

A. A Piece of Lucky Feather

B. A Surprise Christmas Gift

C. The Boring Shopping Experience

D. The Unforgettable Big Hug

3. How does the writer feel about the pretty young lady?

A. Worried.

B. Satisfied.

C. Grateful

D. Proud. 

4.What can we learn from the story?

A. Nobody is sure what will happen the next moment.

B. A simple action can bring other people happiness.

C. Being patient will decrease the waiting time.

D. Life without hope and faith is a full thing.

我国现行法律、行政法规、行政规章和我国参加的国际条约是外贸管制的法律渊源。 ( )