溶酶体存在于动物、植物、原生动物和细菌中。
参考答案:错
—Did you see the CCTV news on TV last night?
—Yes, ______ children had a good festival on Children’s Day.
A.thousand of.
B.ten thousand of.
C.thousands of.
D.ten thousands.
在12:15、6:45、9:00、2:20、6:48各时刻,时针与分针所成角中,锐角、直角、钝角的个数之比为( )
A.3:1:1
B.2:1:2
C.4:1:0
D.1:3:1