托福考试

【单选题】 By the mid-twentieth century, United States presidential staffs, （） had numbered fewer than ten a century earlier, numbered in the hundreds. 
A. as 
B. that they 
C. which 
D. and 

【分析解答题】 (thE morE) kinEtiC (EnErgy in) thE pArtiClEs oF (A mAtEriAl), thE (hottEst) thE mAtEriAl is.

【分析解答题】 instrumEnts thAt (mEAsurE) thE pAssAgE (oF timE) hAvE BEEn in (Exist) For (ABout) 4,000 yEArs.

【单选题】 The color and pageantry, keen rivalry, and high level of competition both contribute to the great worldwide interest in the Olympic Games.

【单选题】Roads in the United States remained crude, ______ with graved or wood planks, until the beginning of the twentieth century.
A、were unsurefaced or they covered them
B、which unsureface or covered
C、unsurfaced or covered them
D、unsurfaced or covered