【华慧考博】考博英语每日一练（12.13）考博加油！
1. A solar day is the length of time ______ the Earth to revolve once around the sun.
A. that takes
B. when it takes
C. it takes
D. to take
2. In 1983 the National Science Foundation (NSF), ______ mission is to promote science, took over the network.
A. their
B. that
C. when
D. whose
【考博英语句子改错练习】
1. A rat’s sharp teeth can gnaw through wood, plaster, or soft metallic such as lead.
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