将用户名"admin"保存到session变量为"username"的写法是
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将用户名"admin"保存到session变量的写法正确的是
A. session['username']="admin"
B. $_session['username']="admin"
C. $_Session['username']="admin"
D. $_SESSION['username']="admin"
销毁$_SESSION['username']写法正确的是
A. $_SESSION['admin']=null
B. unset($_SESSION['admin'])
C. $_SESSION['admin']=""
D. $_SESSION['']
What is wrong about peristalsis?
A. Its plural form is peristalses.
B. It is stimulated by the nerves in the surrounding esophageal tissue.
C. It is a series of defined cartilaginous contractions.
D. It propels the food into the stomach.
According to this TED speech, what are the four main components of the digestive system?
A. gastrointestinal tract
B. accessory organs of digestive system
C. the body’s enzymes, hormones, nerves, and blood
D. mesentery
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