多项选择题

A.为胎儿提供营养
B.解毒作用
C.滋养层形成绒毛膜,内细胞团形成胚盘
D.分泌人绒毛膜促性腺激素(hCG)
相关考题

未知题型 听力原文: Abraham Lincoln was born in a log cabin in Kentucky on February 12, 1809. When he was a small boy, his family moved to file frontier of IndianA.Here, his mother taught him to read and writE.When Lincoln was a young man, his family moved to the new state of Illinois. Lincoln had to earn a living at an early age, but in his leisure time he studied law. He soon became one of the best known lawyers in the state capital at Springfield, Illinois. It was here that Lincoln became famous for his debates with Stephen A.Douglas on the subject of slavery.In 1860, Lincoln was elected President of the United States. He was the candidate of the new Republican Party. This party opposed the creation of new slave states. Soon after his election, some of the Southern states withdrew from the Union and set up the Confederate States of AmericA.This action brought on the terrible Civil War which lasted from 1861 to 1865.On January 1, 1863, during the war, Lincoln issued his famous Emancipation Proclamation. In 1865, after the war ended, the Thirteenth Amendment was added to the Constitution of the United States. This amendment put an end to slavery everywhere in the United States.Early in 1865, the Civil War came to an end with the defeat of the South by the North. Only a few days after the end of the war, Lincoln was shot by an actor named John Wilkes Booth. The President died on April 14, 1865. In his death, the world lost one of the greatest men of all timE.(26)A.In 1809.B.In 1863.C.In 1865.D.In 1860.

未知题型 What does the word 'graduate' (Line 2, ParA.4) mean?A.Finish schooling.B.Change to something elsE.C.CollapsE.D.StanD.

未知题型 在窗体上画一个文本框、一个标签和一个命令按钮,其名称分别为Text1、Label1和 Command1,然后编写如下两个事件过程: Private Sub Command1_Click() strText=InputBox('请输入') Text1.Text=strText End Sub Private Sub Text1_Change() Label1.Caption=Right(Trim(Text1.Text),4) End Sub 程序运行后,如果在对话框中输入abcdefgh,则在标签中显示的内容是 ______。A.空B.abcdefC.abcdD.efgh