题目内容：

    The snow was falling. The schools were over earlier than usual, but much to my surprise my appointment wasn’t canceled. And so I went, feeling especially heroic. Snow or no snow, I’d be on time for my scheduled donation at the local blood center.

When I got there, I discovered four more “hero-types” were already there, with machines quietly collecting their lifesaving gifts. Seeing them made me believe that while I was proud to be there, I wasn’t a hero. And any silly heroic thoughts quickly disappeared as I lay back in my own donor chair and began my donation. I was ready to make a difference in the life of someone I’ d never meet.

My wife Karen is a donor, too. She’s been on the bone marrow (骨髓) list for fifteen years, ever since she signed up to provide bone marrow to a child. That little girl died before Karen’s bone marrow could help her, but Karen was called again recently as it turned out she might be a match for someone else. The caller asked Karen if she’d still be willing to become a bone marrow donor. “Yes,” she said and then immediately began answering questions in preparation for the pages of paperwork to follow. It was a race against time. I wish I could say this race was won, but again it wasn’t.

Last week Karen gave blood and next week I’ll make my usual donation. I’ll clear an afternoon from my schedule and call for an appointment. Whatever blood product they need whole, I’ll gladly give. I don’t know whose life my donation may affect, but it really doesn’t matter. And sadly, while so few among us actually take the time to donate, Karen and I always will.

1.What can be inferred about the author from the first paragraph?

A.He is quite fond of taking risks.

B.He is a man who always keeps his word.

C.The snow almost ruined his appointment.

D.He never thinks donating blood is a heroic deed.

2.What influence did other donors have on the author?

A.They changed his attitude to himself.

B.They helped him find joy in donating.

C.They made him feel it a duty to donate.

D.They strengthened his belief not to be a donor.

3.What does the passage say about Karen and her bone marrow donation?

A.She has been found a match to nobody.

B.She decided to join in it over 20 years ago.

C.She fell in trouble when she came to paperwork.

D.She has already met with two failures in donation.

4.Which of the following shows the author’s opinion?

A.More people should have become donors.

B.The donation itself should have been made easier.

C.Receivers should have been introduced to donors.

D.More blood products should have been developed.