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The dead rate is _____ pigs and recovery usually ______ within 7-10 days.

   A low in; occurs                            B.rich in;happens

  C.high in; came about                       D.poor in;took place

----- Would you like to climb the Mountain Tai on May Day?

  _____, I’d like to.

   A. Yes                B.Great             C.You are right        D.Absolutely

2. Some college students are see doing______work they ca find to support themselves.

A. that         B. which  

C. whatever     D. no matter what

2. Of the two lectures, the first was by far _____, partly because the speaker had such a dynamic style.

A. the best             B. better

C. the better            D. much better

8. As______rule, apples are sold by      weight and eggs by       dozen.

  A. a; 不填；the          B. a; the; the

  C. a; a; the               D. the; 不填；不填

20. I think I was at school,  ______I was staying with a friend during the vacation when I heard the news.

A. even so        B. and then

C. so that         D. or else

---You should have thanked her before you left.

  ---I meant _______. But when I was leaving I couldn’t find her anywhere.

A. to do  B. to  C. doing  D. doing so

Children’s brains can’t develop properly_______ they lack protein(蛋白質(zhì)).

 A. when  B. since  C. because  D. unless

19. The time he has devoted in the past years _______ the disable is now considered ________ of great value.

 A. to help; being      B. to helping; to be

 C. to help; to be      D. helping; being

We will debate the subject_____ late when we have enough time.

A.in vain   B.at length   C.at last  D.in force