单项选择题

犊牛顽固性腹泻，日渐消瘦，死亡，剖检见肠粘膜有大小不等的结节，结节组织学检查见大量巨噬细胞和淋巴细胞侵润，该病原最可能是

A、炭疽杆菌

B、大肠杆菌

C、多杀性巴氏杆菌

D、牛支原体

E、牛分支杆菌

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单项选择题

I. Statements
Directions: In this part of the test, you will hear several short statements. These statements will be spoken ONLY ONCE, and you will not find them written on the paper; so you must listen carefully. When you hear a statement, read the answer choices and decide which one is closest in meaning to the statement you have heard. Then write the letter of the answer you have chosen in the corresponding space in your ANSWER BOOKLET.
A、(A) The trees are being cut down.
　
B、(B) The trees are blocking my view.
　
C、(C) The trees grow better around the office.
　
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