“年龄”属于离散变量。（）

党在社会主义初级阶段基本路线的核心内容是  [ ]

A、把我国建设成为富强、民主、文明的社会主义现代化国家

B、自力更生，艰苦奋斗

C、以经济建设为中心，坚持四项基本原则，坚持改革开放

D、社会主义精神文明建设

阅读理解。

     When Ben delivered milk to my home one morning before Christmas,he wasn't his usual sunny self.

He told me a customer had left without paying the bill,$79,nor leaving her new address. So it meant that

he had to cover the loss.

     "She was a pretty woman,"he said, with six children and another on the way. She was always saying.

'I'm going to pay you soon when my husband gets a second job.' I believed her,but she left. Isn't it annoying?"

     "Give her the milk. Make it a Christmas present to the kids who need it." I said.

     The holidays came and went. On a sunny January morning two weeks later,Ben was rushing to deliver

milk when he saw a woman running down the street,waving money. He recognized her immediately--the

woman who didn't pay her bill.

     "I'm so sorry." she said. "I really have been meaning to pay you."

     She explained that her husband had come home one night and announced he' d found cheaper apartment.

He' d also got a new job. With all that happened, she' d forgotten to leave the new address."But I've been

saving," she said."Here's $20 toward the bill.

     "That' s all right," Ben replied. "It's been paid."

      "Paid!" she exclaimed (惊叫)."What do you mean? Who paid it?"

     "I did," Ben said,"It went to the children as a Christmas present!"

1. Ben was upset one morning because _______.

A. a customer left without paying the bill

B. he lost $ 79 on the way of the delivery

C. he had to buy a present for the children

D. he was going to lose his job

2. The author helped Ben by offering him _______.

A. a Christmas present

B. the debtor' s new address

C. some money to cover the loss

D. a suggestion to cheer him up

3. We can probably infer from the passage that the woman _______.

A. cheated to raise her children

B. moved to escape paying back the debts

C. was a person with honesty

D. wanted to give her children a Christmas gift

4. What is the best title of the passage?

A. An Unhappy Christmas

B. An Unusual Present

C. A Poor Couple's Life

D. A Helpful Customer

证券公司开展融资融券业务试点，必须经中国证券业协会批准。 （ ）

阀门阀芯材料应比阀座材料（），这样才能避免阀座密封面在研磨过程中产生（）或（）。

离开具体条件办事情就会( )。

A．犯形而上学的错误
B．犯盲动主义的错误
C．犯主观主义的错误
D．犯折衷主义的错误