成语“螳螂捕蝉，黄雀在后”所描写的是动物之间的什么关系（ ）
A：合作
B：捕食
C：竞争
D：寄生
— As students, we should ________ the school rules and come to school on time.
— I agree with you.
下列各式运算正确的是（ ）
Aa ____Cc ____Ee ____ ____Hh Ii ____ ____ Ll Mm ____ Oo____ Qq Rr____ Tt Uu ____ Ww Xx Yy Zz
