[单项选择]Why can’’t the library issue library cards to everyone who applies
A. Because it takes too long to process all the applications.
B. Because it is a library for special purpose.
C. Because its resources are limited.
D. Because there is a shortage of staff.

[单项选择]Why can’’t the library issue library cards to everyone who applies
A. Because it takes too long to process all the applications.
B. Because it is a library for special purpose.
C. Because its resources are limited.
D. Because there is a shortage of staff.

[单项选择]Ever wonder why some people can sleep through just about anything, while others get startled awake at each and every bump in the night A new report in the August 10th issue of Current Biology, offers some insight: Sound sleepers show a distinct pattern of spontaneous brain rhythms. "We found that by measuring brain waves during sleep, we could learn a lot about how well a person’s brain can block the negative effects of sounds; the more sleep spindles your brain produces, the more likely you’ll stay asleep, even when confronted with noise," said Jeffrey Ellenbogen of Harvard Medical School.
During sleep, brain waves become slow and organized, Ellenbogen explained. Sleep spindles refer to brief bursts of faster-frequency waves. Those bursts of activity are generated by a portion of the brain called the thalamus (丘脑), which serves as a way station for most types of sensory information (everything except smell).
"The thalamus is likely preventing sensory information fro
A. Brain waves become slow and organized when we sleep.
B. We can measure brain waves during sleep.
C. A person’s brain can block the negative effects of sounds.
D. Sound sleepers show a distinct pattern of spontaneous brain rhythms.

[单项选择]
Why can’t Stella play

[单项选择]Why can’t Sally play
A. He’s a doctor.
B. He’s a lawyer.
C. He’s a child.