_____ three influenza type A virus subtypes(子類型) have been found in pigs.

A. By far             B. As far as           C. So far             D. Till far

C


解析:

考查far短語辨析。句意：迄今為止，在豬身上共發(fā)現(xiàn)3種A型流感病毒的子類型。by far最----，-------得多，用在形容詞和副詞后；as/so far as 就---而言，遠(yuǎn)到------；so far 迄今為止，主句常用現(xiàn)在完成時，分析have been found完成時被動語態(tài)可見so far符合句意和語言用法。

練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源： 題型：

--Take a short rest, will you ?

        --Ok, I’m ___tired after a long walk.

        A.more or less   B.more and more   C.as a result   D.fox example

查看答案和解析>>

科目：高中英語 來源： 題型：

Mary rushed home_______ she heard the news, only______ that her husband was gone.

A. as soon as; finding  B. immediately; to find C. the moment; find D. when; found

查看答案和解析>>

科目：高中英語 來源： 題型：

（江蘇省海安市2009學(xué)年度高三摸底，27）---Your sister nearly _______ all her spare time to her study during the three years.

----That’s right， or she ________ the first place in her school in the College Entrance Examination.

A. devoted; wouldn’t have taken                B. spent; wouldn’t have taken

C. had devoted; hadn’t taken                          D. had spent; couldn’t take

查看答案和解析>>

科目：高中英語 來源： 題型：

Mother told Jim to watch the milk until it boiled and then _____ off the gas.?

　　A. turn       B. turning      C. turned       D. having turned

查看答案和解析>>

科目：高中英語 來源： 題型：

This new-type machine ____.

       A. takes up many rooms            B. take up much room  

C. takes up many room             D. takes up much room

查看答案和解析>>

科目：高中英語 來源： 題型：

The firemen managed to _____ the fire in time.

        A. extinguish                    B. prevent                    C. suppress                    D. ruin

查看答案和解析>>

科目：高中英語 來源： 題型：

They elected Lincoln ___ president of the United States.

        A. a       B. an      C. the       D. /

查看答案和解析>>

科目：高中英語 來源： 題型：

So sudden ________that the enemy had no time to escape. 

A. did the attack      B. the attack did       C. was the attack      D. the attack was

查看答案和解析>>

同步練習(xí)冊答案