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【华慧考博】考博英语每日一练（3.17）考博加油！
1. Although most birds have only a negligible sense of smell, they have ______ vision.
A. vigorous
B. exact
C. acute
D. vivid
2. The study shows that laying too much emphasis on exams is likely to ______ students’ enthusiasm in learning English.
A. hold back
B. hold off
C. hold out
D. hold down
【考博英语补全句子】
1.They’ve fully prepared to ___________________________________（投身于革命事业）.
句意：他们已做好充分准备来投身于革命事业。
2. _______________（青少年犯罪的主要原因是）that social environment is becoming worse.
句意：青少年犯罪的主要原因是社会环境日益恶化。
