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When there are no stimuli, a dog will _________.
When there are no stimuli, a dog will _________.
What is generally thought the main cause of deaths in Chile?
What is generally thought the main cause of deaths in Chile?
Rose answered the letter _________.
Rose answered the letter _________.
The second course at dinner is often _________ at British me
The second course at dinner is often _________ at British meals.
甲绕环形跑道每60秒走一圈，乙绕相对方向行进，每20秒与甲相遇一起，则乙绕一圈所需时间为（ ）秒。
甲绕环形跑道每60秒走一圈，乙绕相对方向行进，每20秒与甲相遇一起，则乙绕一圈所需时间为（ ）秒。 A．15 B．30 C．45 D．50