新生儿呼吸窘迫综合征的临床特点、X线表现如何？

阅读理解。

    Each year, we celebrate many holidays here in America.

    On January 1, we welcome the coming of a new year like many people in other countries. And we

have another, four holidays on the first day of a month: April Fool's Day, May Day, Friendship Day

( Aug.1 ) and Grandparents Day ( Sept.1). The most important holiday for the youngpeople comes in

February. It is Valentine's Day. Lots of boys give red roses to girls as a present.

    People celebrate some holidays for their family members. We say thanks to our mothers in May and

celebrate Father's Day in the following month. In November many people return home for Thanksgiving

Day, so the whole family can stay together.

    There are also some interesting holidays for children.For example, Halloween comes at the end of

October. Children often play with pumpkin lanterns (南瓜灯) and put on all kinds of masks (面具).

    Of course, the most important festival is Christmas. After a year of work and study, people can enjoy

a long holiday, eat big meals, and visit family and friends.

1.How many holidays are there on the first day of a month in America? [ ]

A.Four.

B.Five.

C. Seven.

D.Ten.

2.What is the most important holiday for the young people in America? [ ]

A.Thanksgiving Day.

B.Christmas Day.

C.Valentine' s Day.

D.New Year's Day.

3.From the reading we know that Father's Day comes ______. [ ]

A.in May

B.in April

C.in June

D.in July

4.Halloween is one of the interesting holidays for ______. [ ]

A.children

B.mothers

C.girls

D.students

5.Many people return home in November because they want to ______.[ ]

A.enjoy a long holiday

B.visit their friends

C.eat big meals

D.spend Thanksgiving Day

已知正三棱台上底面边长为2，下底面边长为4，且侧棱与底面所成的角是45°，那么这个正三棱台的体积等于______．

交响音画

VBA中打开窗体的命令语句是 【14】 。

下图为甲种遗传病（基因A、A）和乙种遗传病（基因B、B）的家系图。其中一种遗传病基因位于常染色体上，另一种位于X染色体上。请回答以下问题（概率用分数表示）

III---2的基因型及其概率分别为（）；（）