【简答题】输入圆的半径,输出圆的面积和周长,保留二位小数。 PI=3.14
【单选题】Usually there is ______ traffic in the streets on weekdays than on Sundays.
【单选题】Private cars are required to take turns off roads one out of five weekdays ___the traffic pressure.
【简答题】判断下列说法的正误,并说明理由。 语言符号具有任意性的特点,但复合符号的组合不是任意的。
【单选题】According to the study discussed in the second paragraph, which of the following weekdays is the most productive?
【单选题】根据岩土的水理特性,砂土层与黏土层相比其隔水性()。
【多选题】量语的语法特点是
C.
有时与“一”组合可以构成“一A一A”、“一AA”形式
【单选题】They go to school by bus on weekdays. (变成一般疑问句)
A.
Are they go to school by bus on weekdays?
B.
Does they go to school by bus on weekdays?
C.
Is they go to school by bus on weekdays?
D.
Do they go to school by bus on weekdays?