It is so difficult to ______ the bottom of the ocean because some parts are very deep.
（A）excuse
（B） explore
（C） explain
（D） explode
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更多大学英语备考试题
- 1To make sure he would be able to attend the meeting, I called him up two weeks ______.
- 2The thought ________ her mother may lose eye-sight worries her.()
- 3The first word of a sentence should () a capital letter.
- 4It’s going to rain we’d better ________ our tools and go indoors.()
- 5I don’t think there is () important in today’s paper.
