题目内容

In the reserves of Zimbabwe and South Africa, annual culls (选择性宰杀) are already ______()

A. variation
B. schedule
C. routine
D. route

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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()

A. 闪退
B. 死机
C. 屏幕碎了
D. 中毒了

To further confuse the issue, there is an enormous____ in the amount of sleep people feel happy with()

A. variety
B. variation
C. variability
D. variable

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()

A. immune
B. appealing
C. appearing
D. soothing

These remarkable findings suggest the elephants have built up a_to make distinctions between human voices()

A. capture
B. capacitor
C. capacity
D. captivity

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