A. join
B.attend
C.take part in
D.join in
第1题:
Susan told me she _____lunch, so she was very hungry.
A、has had
B、hasn' t have
C、have had
D、hadn' t had
第2题:
43. They have rice, vegetables and meat_______ lunch.
A. with
B. and
C. for
D. on
第3题:
若51单片机使用频率为6MHz的晶振,则振荡周期为:,机器周期为:,指令周期为:
A.1/6us,2us,不定
B.1/12us,2us,1/3us
C.1/6us,1us,不定
D.1/12us,1us,1/3us
第4题:
( ) – Is Miss White __________ English teacher, Maria?
– No, she teaches __________ geography.
A.your;my
B.you;mine
C.you;us
D.your;us
第5题:

第6题:
SysTick系统定时器延时1s的写法可以是()
A.Delay_us(1000000);
B.Delay_us(500000); Delay_us(500000);
C.Delay_us(400000); Delay_us(500000); Delay_us(100000);
D.Delay_us(1000000); Delay_us(1000000);