1．Racing the clock every day is such an exhausting effort that when I actually have a few free moments, I tend to collapse.
A．fall down B．fall ill C．fall out D．fall behind

2．The senator agreed that his support of the measure would jeopardize his chances for reelection.
A．benefit B．endanger C．hinder D．disturb

3．The microscope enables scientists to distinguish an incredible number and variety of bacteria.
A．unavoidable B．unchangeable C．unbelievable D．unpredictable

參考答案及解析：

1．A。譯文：每天跟時間賽跑太耗精力了，當(dāng)稍有些許閑暇，我就幾乎快要崩潰。collapse倒塌。A選項：倒下，落下。B選項：病倒。C選項：爭吵，爭執(zhí)。D選項：落后。

2．B。譯文：參議員對此項措施的支持將使他再次參選的機會岌岌可危，參議員對此表示同意。jeopardize危害。A選項：益處，有益于。B選項：使處于危險。C選項：妨礙，使滯后。D選項：打擾。

3．C。譯文：顯微鏡使科學(xué)家們能夠區(qū)分出的細(xì)菌的數(shù)量和種類是令人難以置信的。incredible難以置信的。A選項：不可避免的。B選項：不可改變的。C選項：不可信的。D選項：不可預(yù)知的。