《饮膳正要》共几卷？主要包括哪些内容？

钢笔有x支，铅笔的支数比钢笔的9倍多17支，铅笔有______支．当x=10时，铅笔有几支？

在许伯恺老师的书中总共把开光分为几类（）？

A、15.0

B、10.0

C、6.0

D、2.0

80C51有四个工作寄存器区，由PSW状态字中的RS1和RS0两位的状态来决定，单片机复位后，若执行SETBRS0指令，此时只能使用（）的工作寄存器。

A．0区

B．1区

C．2区

D．3区

Motherhood may make women smarter and may help prevent dementia in old age by bathing the brain in protective hormones, US reseachers reported on Thursday.

Tests on rats show that those who raise two or more litters of pups do considerably better in tests of memory and skills than rats who have no babies, and their brains show changes that suggest they may be protected against diseases such as Alzheimer’s. University of Richmond psychology professor Craig Kinsley believes his findings will translate into humans.

"Our research shows that the hormones of pregnancy are protecting the brain, including estrogen, which we know has many neuroprotective effects," Kinsley said.

"It’s rat data but humans are mammals just like these animals are mammals," he added in a telephone interview. "They go through pregnancy and hormonal changes. "

Kinsley said he hoped public health officials and researchers will look to see if having had children protects a woman from Alzheimer’s and other forms of age-related brain decline.

"When people think about pregnancy, they think about what happens to babies and the mother from the neck down," said Kinsley, who presented his findings to the annual meeting of the Society of Neuroscience in Orlando, Florida.

"They do not realize that hormones are washing on the brain. If you look at female animals who have never gone through pregnancy, they act differently toward young. But if she goes through pregnancy, she will sacrifice her life for her infant—that is a great change in her behavior that showed in genetic alterations to the brain. \

What does the phrase "litters of pups" mean in the second paragraph（）

A. Baby rats.

B. Animals.

C. Old rats.

D. Grown-up rats.

下列Applet在窗口中放置一个按钮，并用这个按钮控制弹出窗口的显示和隐藏。请在横线处填写正确的程序。 import java.applet.Applet； import java.awt.*； import java.awt.event.*； public class Test15.extends Applet { Frame frm=new Frame("Test15")； public void init() { Button btn=new Button(“窗口”)； btn.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent ae){ if( 【15】 ) frm.setVisible(false)； else {frm.setSize(200，200)； frm.setVisible(true)； }} })； add(btn)； } }