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【单选题】
截止2019以来的闰秒均为正闰秒,说明( )A.
地球自转速度持续减慢
B.
地球自转速度持续增加
C.
地球公转速度持续减慢
D.
地球公转速度持续增加
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】完形填空。 Ben is ① some plans ② his summer holiday. ③ July, he wants to finish his homework and he would like ④ some housework at home. Sometimes, he ⑤ for his parents. In August, he ⑥ the Internet and p...
【简答题】Mrs. Chang, a new teacher at Park School, wants to know her students in Class 5, Grade 3. Here are the introductions of some of the students. Names Introductions Kelly Kelly has to go to cram school f...
【单选题】关于信息的说法哪种最准确完整的说法是( )。
A.
信息就是新闻消息。
B.
信息的概念非常广泛，从不同的角度对信息可下不同的定义。
C.
信息(Information)，广义地讲，它是信号的模拟型或其符号的集合。
D.
信息只指一般的行情消息。
【简答题】听对话，选择正确答案。 1. Where did Tom go when Jeff called? A. To the hospital B. To the school C. To the post office 2. Who has a cold? A. Tom B. Tom's father C. Tom's mother 3. Why does Jeff call Tom? A. He w...
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【单选题】听力原文： Our family is trying to decide where to go for a vacation this summer. Our son Tom wants to go to Yellow Stone Park again to see the bears. We did that last summer and what an experience it was!...
A.
They haven't reached a decision yet.
B.
They have decided to go hunting bears.
C.
They want to go camping.
D.
They want to go exploring the country.
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