题目内容
What is the meaning of “crashing” in the sentence below？ My MOOC account keeps on crashing when I try to apply for a new course（）
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To further confuse the issue, there is an enormous____ in the amount of sleep people feel happy with（）
The morning warmth changes the flowers in a way to make them more_to insects, perhaps causing them to release more attractive scents earlier in the day（）
These remarkable findings suggest the elephants have built up a_to make distinctions between human voices（）
How many function words are there in the following sentence？ My phone is frozen and I can’t log into my Wechat（）
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