下列各组粒子中属于同位素的是（） A．H2和D2 B．H2O和D2O C．1_爱下问搜题

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问题选择题

下列各组粒子中属于同位素的是（　　）

A．H₂和D₂

B．H₂O和D₂O

C．¹⁶O和¹⁸O

D．²⁴Mg和²⁴Na

答案

答案：C

单项选择题

假设有一款固定收益类理财产品，理财期限为6个月，理财期间固定收益为年收益率3．00％，有一个投资者购买该产品30000元，则6个月到期时，该投资者连本带利共可获得()元。

A．30900

B．30180

C．30225

D．30450

填空题

用方框内所给的适当形式填空。

amuse , they ,interest , decide , nine , rain , care , free , fun , sleep

1. He told us a really ______ story.
2.It will be a ______ day.
3.The movie was boring. I fell ______ half way through it.
4. Tony is ______ in math.
5. Her little son likes to go to an ______ park.
6.I got a photo album on my ______ birthday.
7. He always does his homework ______ .
8. Children enjoyed ______ at the party last night.
9. Bruce needs time and ______ to relax,and he needs time to do things by himself.
10. Fortunately, Yang Lei's mother agreed with her daughter's______ .