2024-04-10点击次数：2224
【华慧考博】考博英语每日一练（4.10）考博加油！
1. This electronic superhighway is called the Internet, ______ it is the backbone (主干) of the World Wide Web.
A. and
B. yet
C. or
D. while
2. Please refrain ______ smoking.
A. from
B. of
C. at
D. against
【考博英语补全句子练习】
1. No one has come up with a convincing explanation of why dinosaurs _________ _________（灭绝）.
句意：没有人能对恐龙灭绝的原因提出令人信服的解释。
2. Mandela _______ ______ _______ in 1994. （曼德拉于1994年上台执政。）
