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()1. Could you help me， please?A. OK.
()2. Thanks a lot.B. You're welcome.
()3. Let's put the books in the box.C. It's Monday.
()4. Can you carry it?D. No ，it's full.
()5. Who's on duty today?E. lam.
()6. Is it empty?F. No ，it's light.
()7. What day is it today?G. Certainly.
()8. Is that bag heavy?H. No. Li Lei isn't here. .
()9. Are we all here today?I. No ，thanks.
()10. Let me help you.J. Yes，I can.
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设随机变量X～N(0，1)，Y～N(0，1)，Cov(X,Y)=0.5，则D(X+Y)=_________.
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蒙台梭利认为，教育的任务就是“使每一个儿童的潜能在一个______的环境中都能得到自我发展的自由”。
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《天净沙·秋思》“枯藤老树昏鸦，小桥流水人家，__________。”
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森林群落通常可划分为乔木层、灌木层、草本层和 ______ 四个层次。
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My uncle is a worker.He works in a f_____
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试题">
图中有① ________ 个三角形，② ________ 个长方形，③ ________ 个梯形.
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Look at the sign. The library is _____ (close) from 1:00 p.m to 2:00 p.m.
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根据提供的情景 ，选择正确的句子，将其标号填在题前的括号内。
A. Let's go to the zoo.B. Can you spell“window ”?
C. Good evening ， Dad.
D. Good night.
E. This is Mr Zhang.
F. Look at the new car.
G. Come and sit here.
H. It's my favourite colour.
()1. 傍晚见到父亲说 ：___________
()2. 你想说这是我最喜欢的颜色：________
()3. 你想叫人拼写窗户这个单词，可以说 ：_________
()4. 你叫汤姆过来坐 ，可以说 ：________
()5. 你想请别人欣赏这辆红色法拉利小轿车，可以说 ：_______
()6. 想邀请别人一起去动物园，可以说 ：________ .
()7. 睡前对母亲说晚安 ，应表达为 ：________
()8. 你向 Helen 介绍一下张老师 ，应该说 ：______
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I’m ten years old and my sister is two years older than me，so she is t_____ years old。